The Crystal Saga

Yeah, that’s not moving.

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fortis : the magical ability to move objects on the physical plane
vs
animus : the magical ability to manipulate things on the spiritual plane

Since I probably won’t go into this too much in plot I’ll explain a bit here. All humans have these abilities, some are better at it than others. Fortis is considered more practical and useful. Example- moving boulders, building bridges, etc. Animus is harder to work and results vary, the practice of it was also illegal for a time. The triplets do a bit of both.