Rayne

Although... I only got 13 xp from Corrie when I talked to her. However, the shaper spy in the house at the NW corner same town (stonespire, right?) is another unlimited xp bug. At least she was for me... I'm not sure if you have to be pro-shaper to get her quest of "Talk to Kyryk", but complete it (don't go kill him right away, besides he gives training and a quest you can do even if pro-rebel) and go back to her house. Close the door and tell her about meeting Kyryk. Repeat until happy with your level. I got 40 xp which dropped to 28 around level 35/36 (can't remember which). She leaves after you leave her house (although you can try to keep her trapped with creations or closing the door really fast). Even so you can still do the find shaper spy quest given to you by creek blade. Sorry if I got any names wrong... I haven't been playing for very long.

In previous Geneforges I usually start out with an Artilla or two and maybe make some drayks/cyrodrayks/drakons near the end. Never really used anything else much, but I've always played as an agent. So far I've just kept Greta, and earlier Alwan as well (and didn't spend half my skill points for most of the game).