Zombie head
Magical lamb egg was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
Magical lamb egg detail

The magical lamb egg could be won from Treasure Hunter. It can be activated to turn the player into a lamb for a brief duration, and then the egg will be consumed, unlike the enchanted lamb egg. It can also be eaten to heal 200 life points. It was made available again during the "Second Chance" Treasure Hunter Promotion from 2 April to 7 April 2015.

Enchanted lamb egg

A player transforms into a lamb.

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