Every ten minutes, if the player is not on a Mine level that is divisible by 5, is not on an [[#Infested Floors|infested floor]], and is not in the [[Quarry Mine]], there is a 1.1% chance for the screen to become "misty", "glowy", or "foggy". This effects lasts 30-40 seconds. During this time, several of the current floor's flying monsters will spawn and attack. The [[Buffs#Oil of Garlic|Oil of Garlic Buff]] prevents these infestation fogs from occurring.<ref name="swarms" /> | Every ten minutes, if the player is not on a Mine level that is divisible by 5, is not on an [[#Infested Floors|infested floor]], and is not in the [[Quarry Mine]], there is a 1.1% chance for the screen to become "misty", "glowy", or "foggy". This effects lasts 30-40 seconds. During this time, several of the current floor's flying monsters will spawn and attack. The [[Buffs#Oil of Garlic|Oil of Garlic Buff]] prevents these infestation fogs from occurring.<ref name="swarms" /> |