In survivors-likes players often don’t click on enemy bodies to loot like in RPGs, things are going to fast. But not all loot is dropped immediately, sometimes a player might need to stay in an area for a certain amount of time, kill a certain amount of enemies, or other small challenge. This might then result in a treasure chest becoming unlocked, portal opened, or other in game event which results in some loot and/or XP. This adds some variety into the run. See also: Treasure Chest.