Harmony - Troop Symmetry

I have an idea to give elves the ability to summon various forest spirits and animals. The question is: can we tie spells to skills without sacrificing existing spells, i.e., we need to create new spells. I would tie four summons to the Avenger: fairy, wolf, ent, dragon. By the way, regarding the mod development, there will be three tiers of creatures: base, champion, and elite. All of this is within the framework of symmetry. We also plan to create a couple of new creatures (for example, a yeti for dwarves, based on a cyclops) and specializations (there will be a heroine called "sea elf").