Tenebium staves
Lol I know, eh?
well with the current model, you are as proficient with a Tenebrium staff as you are with a Tenebrium bastard sword. Maybe the current system is the superior method
With the advent of the tenebrium skill, mages should have a Void spell equivalent, but that's a gripe for another day.
Now, I'd just settle for actually having tenebrium staves in the game...
