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

An oily rag was an item used in the quest, Unstable Foundations. Players had to first rip a rag into half, pour oil over the rag to make the rag an oily rag.

The oily rag was used to help defeat the dragon in the tutorial quest by helping to start a fire on a pillar, causing it to collapse.

Unstable Foundations pillar

A pillar with a fuse attached.