diff --git a/export_assets.py b/export_assets.py
index 2e6aa92..81a2af9 100644
--- a/export_assets.py
+++ b/export_assets.py
@@ -1,11 +1,9 @@
-import hashlib
 import shutil
 from pathlib import Path
 
 from d4dj_utils.manager.asset_manager import AssetManager
-from d4dj_utils.master.master_asset import MasterAsset
 
-from miyu_bot.commands.common.master_asset_manager import MasterFilterManager, hash_master
+from miyu_bot.bot.master_asset_manager import hash_master
 
 
 def main():
diff --git a/main.py b/main.py
index 7808760..3f3b63f 100644
--- a/main.py
+++ b/main.py
@@ -3,20 +3,19 @@ import logging
 
 import discord
 from d4dj_utils.manager.asset_manager import AssetManager
-from discord.ext import commands
 
-from miyu_bot.commands.common.master_asset_manager import MasterFilterManager
+from miyu_bot.bot.bot import D4DJBot
+from miyu_bot.bot.master_asset_manager import MasterFilterManager
 
 logging.basicConfig(level=logging.INFO)
 
 with open('config.json') as f:
     bot_token = json.load(f)['token']
 
-bot = commands.Bot(command_prefix='!', case_insensitive=True)
 
 asset_manager = AssetManager('assets')
+bot = D4DJBot(asset_manager, MasterFilterManager(asset_manager), command_prefix='!', case_insensitive=True)
 
-masters = MasterFilterManager(asset_manager)
 
 bot.load_extension('miyu_bot.commands.cogs.card')
 bot.load_extension('miyu_bot.commands.cogs.event')
diff --git a/miyu_bot/commands/common/aliases/event.py b/miyu_bot/bot/aliases/event.py
similarity index 100%
rename from miyu_bot/commands/common/aliases/event.py
rename to miyu_bot/bot/aliases/event.py
diff --git a/miyu_bot/bot/bot.py b/miyu_bot/bot/bot.py
new file mode 100644
index 0000000..4b03c91
--- /dev/null
+++ b/miyu_bot/bot/bot.py
@@ -0,0 +1,17 @@
+from d4dj_utils.manager.asset_manager import AssetManager
+from discord.ext import commands
+
+from miyu_bot.bot.master_asset_manager import MasterFilterManager
+from miyu_bot.bot.name_aliases import NameAliases
+
+
+class D4DJBot(commands.Bot):
+    assets: AssetManager
+    asset_filters: MasterFilterManager
+    aliases: NameAliases
+
+    def __init__(self, assets, asset_filters, *args, **kwargs):
+        self.assets = assets
+        self.asset_filters = asset_filters
+        self.aliases = NameAliases(assets)
+        super().__init__(*args, **kwargs)
diff --git a/miyu_bot/commands/common/master_asset_manager.py b/miyu_bot/bot/master_asset_manager.py
similarity index 82%
rename from miyu_bot/commands/common/master_asset_manager.py
rename to miyu_bot/bot/master_asset_manager.py
index be276f0..f1baa02 100644
--- a/miyu_bot/commands/common/master_asset_manager.py
+++ b/miyu_bot/bot/master_asset_manager.py
@@ -1,13 +1,12 @@
 import hashlib
-from functools import lru_cache
-from timeit import default_timer
 from typing import Callable, Any, Optional, Union
 
 from d4dj_utils.manager.asset_manager import AssetManager
+from d4dj_utils.master.event_master import EventMaster, EventState
 from d4dj_utils.master.master_asset import MasterDict, MasterAsset
 from discord.ext import commands
 
-from miyu_bot.commands.common.aliases.event import event_aliases
+from miyu_bot.bot.aliases.event import event_aliases
 from miyu_bot.commands.common.fuzzy_matching import FuzzyFilteredMap, romanize
 
 import datetime as dt
@@ -22,7 +21,7 @@ class MasterFilterManager:
             filter_function=lambda m: m.is_released,
             fallback_naming_function=lambda m: m.id,
         )
-        self.events = MasterFilter(
+        self.events = EventFilter(
             self.manager.event_master,
             aliases=event_aliases,
             naming_function=lambda e: e.name,
@@ -99,6 +98,21 @@ class MasterFilter:
             return self.default_filter.values()
 
 
+class EventFilter(MasterFilter):
+    def get_latest_event(self, ctx: commands.Context) -> EventMaster:
+        """Returns the oldest event that has not ended or the newest event otherwise."""
+        try:
+            # NY event overlapped with previous event
+            return min((v for v in self.values(ctx) if v.state() == EventState.Open),
+                       key=lambda e: e.start_datetime)
+        except ValueError:
+            try:
+                return min((v for v in self.values(ctx) if v.state() < EventState.Ended),
+                           key=lambda e: e.start_datetime)
+            except ValueError:
+                return max(self.values(ctx), key=lambda v: v.start_datetime)
+
+
 def hash_master(master: MasterAsset):
     return hashlib.md5(master.extended_description().encode('utf-8')).hexdigest()
 
diff --git a/miyu_bot/bot/name_aliases.py b/miyu_bot/bot/name_aliases.py
new file mode 100644
index 0000000..72a4ed6
--- /dev/null
+++ b/miyu_bot/bot/name_aliases.py
@@ -0,0 +1,58 @@
+from functools import cached_property
+
+from d4dj_utils.manager.asset_manager import AssetManager
+
+
+class NameAliases:
+    assets: AssetManager
+
+    def __init__(self, assets):
+        self.assets = assets
+
+    @cached_property
+    def characters_by_name(self):
+        characters_by_name = {}
+        for character in self.assets.character_master.values():
+            for name in character.full_name_english.split():
+                characters_by_name[name.lower()] = character
+        return characters_by_name
+
+    @cached_property
+    def attributes_by_name(self):
+        return {attribute.en_name: attribute for attribute in self.assets.attribute_master.values()}
+
+    @cached_property
+    def units_by_name(self):
+        units_by_name = {unit.name.lower().replace(' ', '_'): unit for unit in self.assets.unit_master.values()}
+        units_by_name['rondo'] = units_by_name['燐舞曲']
+        units_by_name['special'] = units_by_name['スペシャル']
+        units_by_name['other'] = units_by_name['その他']
+        return units_by_name
+
+    unit_aliases = {
+        'happyaround': 'happy_around!',
+        'happy_around': 'happy_around!',
+        'hapiara': 'happy_around!',
+        'happy': 'happy_around!',
+        'ha': 'happy_around',
+        'peakyp-key': 'peaky_p-key',
+        'peakypkey': 'peaky_p-key',
+        'peaky': 'peaky_p-key',
+        'p-key': 'peaky_p-key',
+        'pkey': 'peaky_p-key',
+        'pkpk': 'peaky_p-key',
+        'pk': 'peaky_p-key',
+        'photonmaiden': 'photon_maiden',
+        'photome': 'photon_maiden',
+        'photon': 'photon_maiden',
+        'pm': 'photon_maiden',
+        'mermaid': 'merm4id',
+        'mmd': 'merm4id',
+        'lyricallily': 'lyrical_lily',
+        'riririri': 'lyrical_lily',
+        'lililili': 'lyrical_lily',
+        'lily': 'lyrical_lily',
+        'lili': 'lyrical_lily',
+        'll': 'lyrical_lily',
+        'fuhifumi': 'lyrical_lily',
+    }
diff --git a/miyu_bot/commands/cogs/card.py b/miyu_bot/commands/cogs/card.py
index 6ab7fc1..206a4d8 100644
--- a/miyu_bot/commands/cogs/card.py
+++ b/miyu_bot/commands/cogs/card.py
@@ -4,24 +4,23 @@ import logging
 
 import discord
 from d4dj_utils.master.card_master import CardMaster
-from d4dj_utils.master.event_master import EventMaster
 from d4dj_utils.master.event_specific_bonus_master import EventSpecificBonusMaster
 from d4dj_utils.master.skill_master import SkillMaster
 from discord.ext import commands
 
-from main import masters, asset_manager
+from miyu_bot.bot.bot import D4DJBot
 from miyu_bot.commands.common.argument_parsing import ParsedArguments, parse_arguments, ArgumentError
 from miyu_bot.commands.common.emoji import rarity_emoji_ids, attribute_emoji_ids_by_attribute_id, \
     unit_emoji_ids_by_unit_id, parameter_bonus_emoji_ids_by_parameter_id
-from miyu_bot.commands.common.event import get_latest_event
 from miyu_bot.commands.common.formatting import format_info
-from miyu_bot.commands.common.master_asset_manager import hash_master
-from miyu_bot.commands.common.name_aliases import characters_by_name, attributes_by_name, units_by_name, unit_aliases
+from miyu_bot.bot.master_asset_manager import hash_master
 from miyu_bot.commands.common.reaction_message import run_tabbed_message, run_reaction_message, run_paged_message
 
 
 class Card(commands.Cog):
-    def __init__(self, bot: commands.Bot):
+    bot: D4DJBot
+
+    def __init__(self, bot):
         self.bot = bot
         self.logger = logging.getLogger(__name__)
 
@@ -123,17 +122,20 @@ class Card(commands.Cog):
         # Not used, but here because it's a valid argument before running require_all_arguments_used.
         display, _ = arguments.single(['display', 'disp'], sort, allowed_operators=['='],
                                       converter=card_attribute_aliases)
-        characters = {characters_by_name[c].id for c in arguments.words(characters_by_name.keys())}
-        units = {units_by_name[unit].id
-                 for unit in arguments.tags(names=units_by_name.keys(), aliases=unit_aliases)}
+        characters = {self.bot.aliases.characters_by_name[c].id
+                      for c in arguments.words(self.bot.aliases.characters_by_name.keys())}
+        units = {self.bot.aliases.units_by_name[unit].id
+                 for unit in arguments.tags(names=self.bot.aliases.units_by_name.keys(),
+                                            aliases=self.bot.aliases.unit_aliases)}
         rarity_names = ['4*', '3*', '2*', '1*', r'4\*', r'3\*', r'2\*', r'1\*']
         rarities = {int(r[0]) for r in arguments.words(rarity_names) | arguments.tags(rarity_names)}
-        attributes = {attributes_by_name[a].id for a in arguments.tags(attributes_by_name.keys())}
+        attributes = {self.bot.aliases.attributes_by_name[a].id
+                      for a in arguments.tags(self.bot.aliases.attributes_by_name.keys())}
 
         event_bonus = bool(arguments.tags(['event', 'eventbonus', 'event_bonus']))
 
         if event_bonus:
-            latest_event = get_latest_event(ctx)
+            latest_event = self.bot.asset_filters.events.get_latest_event(ctx)
             bonus: EventSpecificBonusMaster = latest_event.bonus
 
             if not characters:
@@ -149,7 +151,7 @@ class Card(commands.Cog):
 
         arguments.require_all_arguments_used()
 
-        cards = masters.cards.get_sorted(arguments.text(), ctx)
+        cards = self.bot.asset_filters.cards.get_sorted(arguments.text(), ctx)
         if not (arguments.text() and sort is None):
             sort = sort or CardAttribute.Power
             cards = sorted(cards, key=lambda c: (sort.get_sort_key_from_card(c), c.max_power_with_limit_break))
diff --git a/miyu_bot/commands/cogs/event.py b/miyu_bot/commands/cogs/event.py
index 3ee7c82..856331c 100644
--- a/miyu_bot/commands/cogs/event.py
+++ b/miyu_bot/commands/cogs/event.py
@@ -10,19 +10,20 @@ from d4dj_utils.master.event_master import EventMaster, EventState
 from discord.ext import commands
 from pytz import UnknownTimeZoneError
 
-from main import asset_manager, masters
+from miyu_bot.bot.bot import D4DJBot
 from miyu_bot.commands.common.emoji import attribute_emoji_ids_by_attribute_id, unit_emoji_ids_by_unit_id, \
     parameter_bonus_emoji_ids_by_parameter_id, \
     event_point_emoji_id
-from miyu_bot.commands.common.event import get_latest_event
 from miyu_bot.commands.common.formatting import format_info
 from miyu_bot.commands.common.fuzzy_matching import romanize
-from miyu_bot.commands.common.master_asset_manager import MasterFilter, hash_master
+from miyu_bot.bot.master_asset_manager import hash_master
 from miyu_bot.commands.common.reaction_message import run_paged_message, run_dynamically_paged_message
 
 
 class Event(commands.Cog):
-    def __init__(self, bot: commands.Bot):
+    bot: D4DJBot
+
+    def __init__(self, bot):
         self.bot = bot
         self.logger = logging.getLogger(__name__)
 
@@ -38,14 +39,14 @@ class Event(commands.Cog):
             # Allows relative id searches like `!event +1` for next event or `!event -2` for the event before last event
             if arg[0] in ['-', '+']:
                 try:
-                    latest = get_latest_event(ctx)
-                    event = masters.events.get(str(latest.id + int(arg)), ctx)
+                    latest = self.bot.asset_filters.events.get_latest_event(ctx)
+                    event = self.bot.asset_filters.events.get(str(latest.id + int(arg)), ctx)
                 except ValueError:
-                    event = masters.events.get(arg, ctx)
+                    event = self.bot.asset_filters.events.get(arg, ctx)
             else:
-                event = masters.events.get(arg, ctx)
+                event = self.bot.asset_filters.events.get(arg, ctx)
         else:
-            event = get_latest_event(ctx)
+            event = self.bot.asset_filters.events.get_latest_event(ctx)
 
         if not event:
             msg = f'Failed to find event "{arg}".'
@@ -58,7 +59,7 @@ class Event(commands.Cog):
 
         def generator(n):
             nonlocal current_id
-            new_event = masters.events.get(current_id + n, ctx)
+            new_event = self.bot.asset_filters.events.get(current_id + n, ctx)
             if new_event:
                 current_id = new_event.id
                 return self.get_event_embed(new_event)
@@ -151,7 +152,7 @@ class Event(commands.Cog):
                       description='Displays the time left in the current event',
                       help='!timeleft')
     async def time_left(self, ctx: commands.Context):
-        latest = get_latest_event(ctx)
+        latest = self.bot.asset_filters.events.get_latest_event(ctx)
 
         state = latest.state()
 
@@ -214,7 +215,7 @@ class Event(commands.Cog):
             async with session.get('http://www.projectdivar.com/eventdata/t20') as resp:
                 leaderboard = await resp.json(encoding='utf-8')
 
-        latest = get_latest_event(ctx)
+        latest = self.bot.asset_filters.events.get_latest_event(ctx)
         logo = discord.File(latest.logo_path, filename='logo.png')
         embed = discord.Embed(title=f'{latest.name} t20').set_thumbnail(url=f'attachment://logo.png')
         max_points_digits = len(str(leaderboard[0]['points']))
diff --git a/miyu_bot/commands/cogs/music.py b/miyu_bot/commands/cogs/music.py
index 85ee94f..2de761b 100644
--- a/miyu_bot/commands/cogs/music.py
+++ b/miyu_bot/commands/cogs/music.py
@@ -3,7 +3,6 @@ import contextlib
 import enum
 import logging
 import wave
-from functools import lru_cache
 from inspect import cleandoc
 from typing import Tuple
 
@@ -13,18 +12,19 @@ from d4dj_utils.master.common_enums import ChartSectionType
 from d4dj_utils.master.music_master import MusicMaster
 from discord.ext import commands
 
-from main import asset_manager, masters
+from miyu_bot.bot.bot import D4DJBot
 from miyu_bot.commands.common.argument_parsing import parse_arguments, ArgumentError, list_operator_for
 from miyu_bot.commands.common.emoji import difficulty_emoji_ids
 from miyu_bot.commands.common.formatting import format_info
 from miyu_bot.commands.common.fuzzy_matching import romanize
-from miyu_bot.commands.common.master_asset_manager import hash_master
-from miyu_bot.commands.common.name_aliases import units_by_name, unit_aliases
+from miyu_bot.bot.master_asset_manager import hash_master
 from miyu_bot.commands.common.reaction_message import run_tabbed_message, run_paged_message
 
 
 class Music(commands.Cog):
-    def __init__(self, bot: commands.Bot):
+    bot: D4DJBot
+
+    def __init__(self, bot):
         self.bot = bot
         self.logger = logging.getLogger(__name__)
 
@@ -54,7 +54,7 @@ class Music(commands.Cog):
     async def song(self, ctx: commands.Context, *, arg: commands.clean_content):
         self.logger.info(f'Searching for song "{arg}".')
 
-        song = masters.music.get(arg, ctx)
+        song = self.bot.asset_filters.music.get(arg, ctx)
 
         if not song:
             msg = f'No results for song "{arg}".'
@@ -67,7 +67,7 @@ class Music(commands.Cog):
             thumb = discord.File(song.jacket_path, filename='jacket.png')
         except FileNotFoundError:
             # Just a fallback
-            thumb = discord.File(asset_manager.path / 'ondemand/stamp/stamp_10006.png', filename='jacket.png')
+            thumb = discord.File(self.bot.assets.path / 'ondemand/stamp/stamp_10006.png', filename='jacket.png')
 
         embed = discord.Embed(title=song.name)
         embed.set_thumbnail(url=f'attachment://jacket.png')
@@ -107,7 +107,7 @@ class Music(commands.Cog):
         self.logger.info(f'Searching for chart "{arg}".')
 
         name, difficulty = self.parse_chart_args(arg)
-        song = masters.music.get(name, ctx)
+        song = self.bot.asset_filters.music.get(name, ctx)
 
         if not song:
             msg = f'Failed to find chart "{name}".'
@@ -129,7 +129,7 @@ class Music(commands.Cog):
         self.logger.info(f'Searching for chart sections "{arg}".')
 
         name, difficulty = self.parse_chart_args(arg)
-        song = masters.music.get(name, ctx)
+        song = self.bot.asset_filters.music.get(name, ctx)
 
         if not song:
             msg = f'Failed to find chart "{name}".'
@@ -179,8 +179,9 @@ class Music(commands.Cog):
             reverse_sort = sort_op == '<' or arguments.tag('reverse')
             display, _ = arguments.single(['display', 'disp'], sort, allowed_operators=['='],
                                           converter=music_attribute_aliases)
-            units = {units_by_name[unit].id
-                     for unit in arguments.tags(names=units_by_name.keys(), aliases=unit_aliases)}
+            units = {self.bot.aliases.units_by_name[unit].id
+                     for unit in arguments.tags(names=self.bot.aliases.units_by_name.keys(),
+                                                aliases=self.bot.aliases.unit_aliases)}
 
             def difficulty_converter(d):
                 return int(d[:-1]) + 0.5 if d[-1] == '+' else int(d)
@@ -188,7 +189,7 @@ class Music(commands.Cog):
             difficulty = arguments.repeatable(['difficulty', 'diff', 'level'], is_list=True,
                                               converter=difficulty_converter)
 
-            songs = masters.music.get_sorted(arguments.text(), ctx)
+            songs = self.bot.asset_filters.music.get_sorted(arguments.text(), ctx)
 
             arguments.require_all_arguments_used()
         except ArgumentError as e:
@@ -230,7 +231,7 @@ class Music(commands.Cog):
             thumb = discord.File(song.jacket_path, filename='jacket.png')
         except FileNotFoundError:
             # fallback
-            thumb = discord.File(asset_manager.path / 'ondemand/stamp/stamp_10006.png', filename='jacket.png')
+            thumb = discord.File(self.bot.assets.path / 'ondemand/stamp/stamp_10006.png', filename='jacket.png')
 
         files = [thumb]
 
diff --git a/miyu_bot/commands/cogs/utility.py b/miyu_bot/commands/cogs/utility.py
index e1c5a4a..553e92f 100644
--- a/miyu_bot/commands/cogs/utility.py
+++ b/miyu_bot/commands/cogs/utility.py
@@ -2,11 +2,14 @@ import logging
 
 from discord.ext import commands
 
+from miyu_bot.bot.bot import D4DJBot
 from miyu_bot.commands.common.fuzzy_matching import romanize, FuzzyMatcher
 
 
 class Utility(commands.Cog):
-    def __init__(self, bot: commands.Bot):
+    bot: D4DJBot
+
+    def __init__(self, bot):
         self.bot = bot
         self.logger = logging.getLogger(__name__)
 
diff --git a/miyu_bot/commands/common/argument_parsing.py b/miyu_bot/commands/common/argument_parsing.py
index 9368ad0..3f60216 100644
--- a/miyu_bot/commands/common/argument_parsing.py
+++ b/miyu_bot/commands/common/argument_parsing.py
@@ -1,10 +1,10 @@
 import re
 
-# https://stackoverflow.com/questions/249791/regex-for-quoted-string-with-escaping-quotes
-# https://stackoverflow.com/questions/21105360/regex-find-comma-not-inside-quotes
 from collections import namedtuple
 from typing import Dict, List, Optional, Container, Any, Union, Callable, Set, Iterable
 
+# https://stackoverflow.com/questions/249791/regex-for-quoted-string-with-escaping-quotes
+# https://stackoverflow.com/questions/21105360/regex-find-comma-not-inside-quotes
 # The ` ?` is just so it matches the space after during the replace with blank so there's no double spaces
 _param_re = re.compile(
     r'(([a-zA-Z]+)(!=|>=|<=|>|<|==|=)(("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\'|[^,\s]+)(,("(?:[^"\\]|\\.)*"|\'(?:[^\'\\]|\\.)*\'|[^,\s]+))*)) ?')
diff --git a/miyu_bot/commands/common/emoji.py b/miyu_bot/commands/common/emoji.py
index b0cafac..5982e1b 100644
--- a/miyu_bot/commands/common/emoji.py
+++ b/miyu_bot/commands/common/emoji.py
@@ -7,7 +7,6 @@ difficulty_emoji_ids = {
     ChartDifficulty.Expert: 790050636225052694,
 }
 
-# \:buff_power: \:buff_heart: \:buff_technique: \:buff_physical:
 parameter_bonus_emoji_ids = {
     'all': 792930826735583293,
     'heart': 792096971040620564,
diff --git a/miyu_bot/commands/common/event.py b/miyu_bot/commands/common/event.py
deleted file mode 100644
index 9e889f9..0000000
--- a/miyu_bot/commands/common/event.py
+++ /dev/null
@@ -1,19 +0,0 @@
-from d4dj_utils.master.event_master import EventMaster, EventState
-from discord.ext import commands
-
-from main import masters
-
-
-def get_latest_event(ctx: commands.Context) -> EventMaster:
-    """Returns the oldest event that has not ended or the newest event otherwise."""
-    try:
-        # NY event overlapped with previous event
-        return min((v for v in masters.events.values(ctx) if v.state() == EventState.Open),
-                   key=lambda e: e.start_datetime)
-    except ValueError:
-        try:
-            return min((v for v in masters.events.values(ctx) if v.state() < EventState.Ended),
-                       key=lambda e: e.start_datetime)
-        except ValueError:
-            return max(masters.events.values(ctx), key=lambda v: v.start_datetime)
-
diff --git a/miyu_bot/commands/common/name_aliases.py b/miyu_bot/commands/common/name_aliases.py
deleted file mode 100644
index 8cb0eff..0000000
--- a/miyu_bot/commands/common/name_aliases.py
+++ /dev/null
@@ -1,40 +0,0 @@
-from main import asset_manager
-
-characters_by_name = {}
-for character in asset_manager.character_master.values():
-    for name in character.full_name_english.split():
-        characters_by_name[name.lower()] = character
-
-attributes_by_name = {attribute.en_name: attribute for attribute in asset_manager.attribute_master.values()}
-
-units_by_name = {unit.name.lower().replace(' ', '_'): unit for unit in asset_manager.unit_master.values()}
-units_by_name['rondo'] = units_by_name['燐舞曲']
-units_by_name['special'] = units_by_name['スペシャル']
-units_by_name['other'] = units_by_name['その他']
-unit_aliases = {
-    'happyaround': 'happy_around!',
-    'happy_around': 'happy_around!',
-    'hapiara': 'happy_around!',
-    'happy': 'happy_around!',
-    'ha': 'happy_around',
-    'peakyp-key': 'peaky_p-key',
-    'peakypkey': 'peaky_p-key',
-    'peaky': 'peaky_p-key',
-    'p-key': 'peaky_p-key',
-    'pkey': 'peaky_p-key',
-    'pkpk': 'peaky_p-key',
-    'pk': 'peaky_p-key',
-    'photonmaiden': 'photon_maiden',
-    'photome': 'photon_maiden',
-    'photon': 'photon_maiden',
-    'pm': 'photon_maiden',
-    'mermaid': 'merm4id',
-    'mmd': 'merm4id',
-    'lyricallily': 'lyrical_lily',
-    'riririri': 'lyrical_lily',
-    'lililili': 'lyrical_lily',
-    'lily': 'lyrical_lily',
-    'lili': 'lyrical_lily',
-    'll': 'lyrical_lily',
-    'fuhifumi': 'lyrical_lily',
-}