Best way to force wight-mage conversion?

[Lazy_Perfectionist]

I didn't say there wasn't anything to spend gems on... just not Much. Darkness? Sorry. Shadow Blast? Nope, you'd need a booster for every mage... Behemoths?

It's not that Umbrals are worthless, just that you can only summon one per mage, and it'll be much easier to spare enough gems to twiceborn a field Oracle than it would be if you were Ctis and relying on wights, bane lords, or darkness. Especially since your battle magic relies primarily on earth.