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

A rift sunderer is an item won on Treasure Hunter. They can be used to teleport to an open Small or Large Rift and check on reward progress with Zumblefloof. Each rift sunderer grants 25 reward points and 50 times the experience per action compared to closing one without a rift sunderer. Each interaction with a rift destroys a rift sunderer. Teleporting does not destroy them.