One inert wand and one elemental essence. AFAIK tenebrium aka witchcraft wands can't be crafted, but it could be some combination I don't know.
If you check the Divinity Wikia for DOS EE Crafting, dumped ALL crafting recipes straight from the game files. If its possible to craft, its there, if its not.. its not there.
Sadly, I haven't gotten far enough into the game to see the other 3 wand core types.. if you know them, feel free to change the cores list.
