did you eat enuf? for the deadraiser you need 100 eitr. so you need 2 foods for that.

Made the ice staff and ate the Seeker apic and a Magecap

Restarted the game and it fixed itself O.o

Yggdrasil porridge and seeker aspic are the 2 you are looking for , for eitr :)

You need 2 eitr foods to have enlugh mana to do anything.

Frost staff requires 5 eitr which means he should have been able to use it. Fire staff is 35 eitr. As long as you have the minimum you will be able to use the corresponding staff. His was glitched and fixed with a restart.