Zombie head
Incomplete obsidian idol (head, body, legs) was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
[FAQ] • [doc]

The Incomplete obsidian idol (with the head, body and legs) is created by combining an obsidian idol head, obsidian idol body and obsidian idol legs. It provides experience in the Construction, Defence, Herblore, Mining, and Woodcutting skills.