Witch

A witch is a normal mob which can only spawn on your Private Island, although it spawns rarely. There are no tougher or higher leveled variants due to its spawn location.

Behavior
Attacks from range with potions. The player will be notified when they are de-buffed from a witch attack (for example the game will say in chat if the player was damaged by a harming potion).

Strategy
Witches aren't really a threat, but if you want to kill them efficiently, just spam them with your sword so fast that they are too busy drinking their healing potion(s) to attack.

Drops
It can drop a variety of items, such as Glowstone dust, Gunpowder, or Glass Bottle(s)

Trivia

 * Prior to release 1.9, witches did not make any sounds at all, not even idle sounds or damaged sounds.