Wither Key

The Wither Key is a key that can be obtained in Dungeons. It's used to open wither doors. When a player picks it up, it increases the number of wither keys on the sidebar by one.

Obtaining
It is obtained by killing every mob with a Star next to it's name, or a Dungeon Mobs in 1 room (the room where the player enters the dungeon, or a room entered by a wither door).

Players cannot hold this in the inventory, instead it is kept in the scoreboard.

Wither Doors
Wither doors are doors that are colored black, they look a bit like coal blocks.. You either left click or right click on the Wither door if you or your teammates have obtained a wither key, and it will open.

There are usually 2-4 wither doors in a dungeon run. People who speedrun focus on getting the keys instead of secrets and clearing puzzles.

Wither Keys are not only usable by the person who obtained it, but others can also use it.