[SUGGESTION]Making summoning come back in style
The units that you summon now are only useful early game, and the scale really badly. This includes the ones that Resoln gets (not the splitting demons, they are fine).
My suggestion is to add extra spells that will help the summoned units:
Build fire: Level 5 fire magic spell. Will split your fire elemental into a group of two elementals
Force wind: Level 4 air: Gives air elemental +5 attack +1 initiative and +20hp
Sword of stone: Level 4 earth. Gives earth elemental a sword that gives +10 attack
+++ you get the picture. We need a transition of the summons into late game useful units.