[Endoperez]

That would be a piece of some long-dead specimen of his, surely.

It could fit, at least for some. There are many similar examples spread throughout Dominions: Skull Staff is like this for most humans; Pangaean hero, the Black Bull, has his father's skull on his staff; Hangadrotts seemingly killed themselves; I'm not sure if any Ermorian mages do this, but they surely would...

However, the Dying Treelord is an exception. Just like normal Vanadrotts wouldn't go around sacrificing any of the precious few Vanir, or most Pandemoniacs having anything else than a human's skull on their staffs, etc. I would allow the Dying Treelord hands, if it was otherwise balanced. Or maybe mobility. He is dying, so he mightn't care how dangerous flying around effectively rootless is...