Zombie head
Key to the Crossing (birthday) was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
Key to the Crossing (birthday) detail

A key to the crossing (birthday) is obtained after activating the Magister teleport tablet obtained from the Menaphos birthday gift box. It has the same one-time functionality as a regular key to the Crossing.

If this key is in the inventory along with multiple keys to the crossing, this key will be used first when consuming a key to fight The Magister.

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