I'd say 30 druid is the best option.
http://nwn2db.com/build/?205754
While very minmaxed (Doesn't really harm much of anything, your carrying capacity is fine with bull's STR enabled. I usually RPed it as a druid who disliked their physical form and just maintained what was necessary for their survival.) this build is highly effective. The Int isn't exactly "necessary" (save for moar RP skills), so, if the minmaxing makes you feel uncomfortable, you can always drop int down.
Wisdom should be maxed, and stay as high as possible. Conjuration is a wonderful school, and features devastating spells like mass drown, swamp lung, storm of vengeance, etc. I'd say its the druid's most potent and most variable school (while it doesn't have MANY spells, it has most of your offensive spells and it has spells to target all the saving throws). Hence, the spell focus in it.
Natural Spell, if of course, essential. You know about the Kaedrin's feats, so, I will assume you know a little bit about druid.
The server doesn't have emberguard form, but, dragon form is enhanced (druid levels 28, 29, and 30 all buff it). You'll easily hit 60+ AC with ICE on, as well as your buffs.
I believe the arctic wolf does grow in size, yes.