Broken Valley should be easy for you; IIRC the dragon general at the mountain entrance is level 28, and the fortresses there are a little easier than that for Kali; the fortresses for Stone and Raze are easiest, while Keara is the hardest.
For Raze, just being a higher level, presumably with better weapons, you should do damage faster than before, which should make the combat easier. As for technique, you may have already seen this, but:
Stand near one of the regeneration chambers, and that will be the one he goes for when his health gets down; if you temporarily deactivate that one using the nearby lever (or block his path with your creature, summons and/or his summoned walking armours), he should not be able to make it to the other chamber (Rush Attack, a bow or magic should be able to finish him off).
General Raze how defeated?
