I'm a Kerra Warden, so maybe a bit biased... My stats are all good although I'm apparently not as bright as I feel lol. There are options every 10 levels to increase your Wis (always choose Wis) and also power or power regen. I have chosen wis and power regen every time and am almost always the first in the group back to full power (of course I'm also a provisioner who drinks heavily, lol). So if you wanna be a Kerra, and hey, who wouldn't, a Kerra Defiler sounds great. Of course, imo, life is better in Queynos, as long as you move away from the Nettleville slums...