[Twan]

Personnally I like regeneration at nature 4, but I think having a regeneration bless is more balanced if you can't have regen without berserking (your sacred troops regenerate but won't survive a defeat in most cases, and your sacred mages die often after a berserking crisis).

Why not giving regen + berserking (0) at nature 4, then for example a 80% poison resistance at nature 9 ? (after all air 9 just give a 80% resist). Nature 4 won't be a no brainer in this case, after seeing two or three times their berserk prophet or best sacred mage charge alone after recieving one arrow, players won't use nature 4 in all games.