Although the tooltip for the prism shows that a skeleton is set after killing a wither skeleton, the internal name is Woot:wither.skeleton.

So it is processed as a Wither skeleton and the drops will include "Wither Skelly Heads"

Need to see if we can get the tooltip to display the correct/clearer name.
The only issue of course is that "Wither Skeleton" is probably never mentioned in the MC code, it is just a type 1 skeleton.

One problem is that I store the display name at the point that the prism is used. Therefore when this is fixed, previous prisms/controllers will still show the old name

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