Mega Rune Stone

Mega Rune Stone is an item used for spawning the boss Clunkhead.

Spawning Clunkhead
The Mega Rune Stone's only use is for spawning Clunkhead.

When used on a Clunkhead Altar, Clunkhead will spawn. This will consume 1 durability of Mega Rune Stone. If spawned on Peaceful difficulty, Clunkhead will not spawn, the Mega Rune Stone won't lose durability and a message will appear in chat warning the player that boss can't be spawned on Peaceful difficulty. Mending has no effect on the item's durability, but Unbreaking does.

History
超级符文