Hatchet head (dragon)
Cog (2009 Easter event) was removed after an update.
The contents of this page no longer exist in RuneScape, and this article is kept for historical purposes.
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Cog (2009 Easter event) detail

A cog was used in the 2009 Easter event and was used to fix the broken incubator. It was found in one of the crates in the Easter Bunny's egg plant. This item could not be taken out of the warren.