This mod had quite a few, and perhaps they could be restored?

The Necromancer Staff and the amber rod are great, but I have no idea what to do with the transmuting rod, since there is only one type of vis and wand rods can not influence the crystal discount.

Adding onto this, what about the infernal core from Forbidden Magic?

right now it is part of polymancy, together with a new chorus wand

What about the wand caps from Thaumic Exploration? There were two there as well.