[Dragar]

The thing is the berserk is as often a disadvantage as an advantage, given if you're running a bless it is often going to be with sacred mages too

I reckon some poison resistance, 50% say, would be suitable.

I wouldn't say that nature is weak; it just isn't that strong for damaging combat spells, most of the nature spells you'd cast in combat are buffs. Its rituals are very powerful, the supply benefit on mages is very handy and there are plenty of good items.