I haven't gotten to the fight buying part yet, but I did want to share a new unit: The Contemplator. It's a beholder-type unit that is level 4 and has strange new abilities. It accumulates energy each turn, and when it has enough energy its abilities do extra things. Normally it's an archer with magic damage.
The abilities: First it can shoot a beam of fire that hits everything through a straight line. If he has enough energy, it does 50% more damage and can cause burning. Second, it can cause an energy pulse that does damage out to three squares from his body. If he has enough energy it can also push back and stun weaker and it does 50% more damage. Finally, it can enter a fighting trance to do 50% more damage with its regular attack, but it can't use skills if it does that. If he has max energy when he uses the trance, his shot gains a 60% chance to hypnotize (

) units it hits for 1 turns (levels 1-4 only).