Zombie head
Spare sock was removed from RuneScape after Update:Ninja Fixes to Invention - Live Stream Info - Other News, but still exists in-game for those who had obtained it.
[FAQ] • [doc]
Spare sock detail

Spare sock is an item used in Meg's cases. It is requested by the turoth who believes he was scammed by Thessalia, who sold him a pair of socks, not aware at the time that turoth have 3 legs.