[vali]

Nice! I know you probably have plenty of ideas, but here are some more:

Mott Irregulars: Troops with high magic resistance and swamp survival.
Shapechanger summons (Soletaken and D'ivers). For D'ivers, you could use a string of #secondshape to represent the many individual creatures that compose the D'ivers.

If you're limiting the priests for balance reasons, that makes sense. That said, there's lots of options for adding fun and interesting priests. Driss priests that suffer old age and spread unrest, berserk priests of the Boar of Summer/Trake, disease spreading priests of Poleil, ect..

And of course, there are no lack of options for pretender gods.

I'll give this mod a shot and give you my thoughts on balance and such later. I'm just so excited to see a Malazan mod I couldn't help but add some ideas.