diff --git a/Adventures in Lestoria Tests/MonsterTests.cpp b/Adventures in Lestoria Tests/MonsterTests.cpp
index c7dfc4e1..32a3f624 100644
--- a/Adventures in Lestoria Tests/MonsterTests.cpp	
+++ b/Adventures in Lestoria Tests/MonsterTests.cpp	
@@ -532,7 +532,25 @@ namespace MonsterTests
 			Game::Update(1.f);
 			parrot.Hurt(parrot.GetMaxHealth(),parrot.OnUpperLevel(),parrot.GetZ());
 			Assert::IsTrue(parrot.IsUnconscious(),L"Parrot should now be unconscious.");
-
+		}
+		TEST_METHOD(MonsterCollisionRadiusTest){
+			Monster&parrot{game->SpawnMonster({},MONSTER_DATA.at("Parrot"))};
+			Game::Update(1.f);
+			Game::Update(1.f);
+			Assert::AreEqual(parrot.GetOriginalCollisionRadius(),parrot.GetCollisionRadius(),L"Parrot collision radius should be normal.");
+
+			Assert::AreEqual(int(game->GetPlayer()->GetMaxHealth()-parrot.GetCollisionDamage()),game->GetPlayer()->GetHealth(),L"Player should take collision damage from the parrot.");
+			parrot.SetCollisionRadius(0.f);
+			Assert::AreEqual(0.f,parrot.GetCollisionRadius(),L"Parrot collision radius should now be zero.");
+			game->GetPlayer()->Heal(game->GetPlayer()->GetMaxHealth());
+			game->GetPlayer()->_SetIframes(0.f);
+			parrot.SetPos({});
+			game->GetPlayer()->ForceSetPos({});
+			Game::Update(1.f);
+			Assert::AreEqual(game->GetPlayer()->GetMaxHealth(),game->GetPlayer()->GetHealth(),L"Player should be full health.");
+			parrot.SetCollisionRadius(parrot.GetOriginalCollisionRadius());
+			Game::Update(1.f);
+			Assert::AreEqual(int(game->GetPlayer()->GetMaxHealth()-parrot.GetCollisionDamage()),game->GetPlayer()->GetHealth(),L"Player should take collision damage from the parrot.");
 		}
 	};
 }
\ No newline at end of file
diff --git a/Adventures in Lestoria/Monster.cpp b/Adventures in Lestoria/Monster.cpp
index 97496a73..543831ac 100644
--- a/Adventures in Lestoria/Monster.cpp	
+++ b/Adventures in Lestoria/Monster.cpp	
@@ -1560,7 +1560,7 @@ std::optional<std::weak_ptr<Monster>>Monster::GetNearestMonster(const vf2d point
 }
 
 const bool Monster::InUndamageableState(const bool onUpperLevel,const float z)const{
-	return Invulnerable()||!IsAlive()||onUpperLevel!=OnUpperLevel()||AttackAvoided(z)||IsNPC();
+	return Invulnerable()||!IsAlive()||onUpperLevel!=OnUpperLevel()||AttackAvoided(z)||IsNPC()||GetCollisionRadius()<=0.f;
 }
 
 void Monster::AddBuff(BuffRestorationType type,BuffOverTimeType::BuffOverTimeType overTimeType,float duration,float intensity,float timeBetweenTicks){
diff --git a/Adventures in Lestoria/Player.cpp b/Adventures in Lestoria/Player.cpp
index e345ae1c..55f13530 100644
--- a/Adventures in Lestoria/Player.cpp	
+++ b/Adventures in Lestoria/Player.cpp	
@@ -635,7 +635,7 @@ void Player::Update(float fElapsedTime){
 	for(std::shared_ptr<Monster>&m:MONSTER_LIST){
 		const float playerRadius{12*GetSizeMult()/2};
 		const float monsterRadius{m->GetCollisionRadius()};
-		if(!HasIframes()&&abs(m->GetZ()-GetZ())<=1&&OnUpperLevel()==m->OnUpperLevel()&&geom2d::overlaps(geom2d::circle(pos,playerRadius),geom2d::circle(m->GetPos(),monsterRadius))){
+		if(!HasIframes()&&abs(m->GetZ()-GetZ())<=1&&OnUpperLevel()==m->OnUpperLevel()&&monsterRadius>0.f&&geom2d::overlaps(geom2d::circle(pos,playerRadius),geom2d::circle(m->GetPos(),monsterRadius))){
 			if(m->IsAlive()){
 				m->Collision(this);
 			}
diff --git a/Adventures in Lestoria/Sandworm.cpp b/Adventures in Lestoria/Sandworm.cpp
index 4d09936f..59bc6790 100644
--- a/Adventures in Lestoria/Sandworm.cpp	
+++ b/Adventures in Lestoria/Sandworm.cpp	
@@ -55,9 +55,14 @@ void Monster::STRATEGY::SANDWORM(Monster&m,float fElapsedTime,std::string strate
 	switch(PHASE()){
 		case INITIALIZE:{
 			SETPHASE(UNDERGROUND);
+			const float randomRange=util::random_range(0,ConfigFloat("Burrow Target Range")/100.f*24);
+			m.V(A::LOCKON_POS)=game->GetPlayer()->GetPos()+vf2d{randomRange,util::random(2*PI)}.cart();
 		}break;
 		case UNDERGROUND:{
 			m.SetCollisionRadius(0.f);
+			RUN_TOWARDS(m,fElapsedTime,"Run Towards");
+			m.PerformAnimation("SWIM",m.GetFacingDirection());
 		}break;
+		
 	}
 }
\ No newline at end of file
diff --git a/Adventures in Lestoria/Version.h b/Adventures in Lestoria/Version.h
index 45ae6eb7..9212c95e 100644
--- a/Adventures in Lestoria/Version.h	
+++ b/Adventures in Lestoria/Version.h	
@@ -39,7 +39,7 @@ All rights reserved.
 #define VERSION_MAJOR 1
 #define VERSION_MINOR 3
 #define VERSION_PATCH 0
-#define VERSION_BUILD 11711
+#define VERSION_BUILD 11714
 
 #define stringify(a) stringify_(a)
 #define stringify_(a) #a
diff --git a/Adventures in Lestoria/assets/config/MonsterStrategies.txt b/Adventures in Lestoria/assets/config/MonsterStrategies.txt
index 5ecb55ed..04cd9089 100644
--- a/Adventures in Lestoria/assets/config/MonsterStrategies.txt	
+++ b/Adventures in Lestoria/assets/config/MonsterStrategies.txt	
@@ -1121,7 +1121,8 @@ MonsterStrategy
 	}
 	Sandworm
 	{
-
+		# Furthest distance sandworm travels from the player while burrowing.
+		Burrow Target Range = 400
 	}
 	Pirate Buccaneer
 	{