Terrain and systems look really nice, but the abilities seem pretty random for me.
Sure quick strike and poison powder fit the assasin, but I dont see synergy between spells. The effects also seemed a bit blunt. I would wish to see the hero throw something atleast if he is going to use poison powder, now there was only baneling explosion? where did it come from?
would be better if you post the triggers and show what is wrong. You can use arrays in unit groups, but my quess is have made some mistake when assigning units to group or when picking them from groups.