Shulkers were added to Minecraft in the 1.9 Combat Update released in 2016, spawning in End cities on the outer End islands after players defeat the Ender Dragon. The mob stays inside a purpur-coloured shell that blends with End city blocks, then opens to fire guided projectiles that cause levitation. Defeated shulkers can drop shells used to craft shulker boxes, portable storage that keeps items inside when broken. That mix of camouflage, defence and storage made the mob memorable, and its clicking shell sounds became a familiar shorthand in gameplay videos and edits.