Search the forums for "cold as ice" there is quite a number of good threads on the subject with builds.
personally my warrior finally did it with a Grenths Balance Build
Let the Griffin lay down all his spirits
go up one of the hills and hit him with a long bow (you'll be out of spirit range but be able to hit him and pull him)
As he runs towards you swap back to you sword.
Put up both risposte
Once he has you quite low on health hit him with Grenths Balance.
At about this time he will be ready to start laying down spirits again. Run away.
Just keep repeating this - staying out of spirit range
Eventually he will be too low for Grenths Balance - so bring a skill that causes bleeding
Also a running skill helps
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