The enchanted bunny egg is an item that can be won from Treasure Hunter. It can be activated to turn the player into a bunny for 5 minutes. Unlike its magical counterpart, the enchanted bunny egg does not get consumed after activating. The egg was made available from Treasure Hunter again from 2 April to 7 April 2015.
The egg cannot be used in PvP areas. While transformed into a bunny, you cannot move, people cannot right click on you. You do show up in the right-click menu if another clickable object is on the same square, however.
Treasure Hunter eggs