Holy %#@! what a badass!
Definitely could find use for Kasna here, as Dhalekar is meant to fail in his plot against Uthlyn somehow, and I know I'd love to read this chick just messing UP some undead!
As far as the Queen of the Tower subplot goes, Kasna could easily be a heroine to rescue either Averella (and possibly Urtok as well in his own rescue attempt for Averella as he seems like the type who could get lost in some ancient fae goddess labyrinth temple hehe!) should Paradox and Spice be willing to merge into that subplot with them. I could see some interesting things here, lots of crazy happenings in the Labyrinth (without discovering the hidden laboratory below, so the overall plot can continue on afterwards), and maybe even encountering Dhalekar, and utterly whooping his boney butt (where upon later it is discovered that he keeps his soul in a phylactery and has not truely perished!)
It could be a glorious adventure!
Also, and I'm not sure how it could all work out, but there could be some interesting mutual disdain between Kasna and Jobias, as Kasna being a White Lily, is likely privy to hearing of a Mordecai who was banished from the order as well as exiled from Connlaoth's capital. Jobias has probably heard of Kasna too, the famous goddess of war in the fabled Knights of the White Lily, and likely does not enjoy her ruthlessness against ALL mages.
Cool stuff, lots to work with, any ideas?