In fire magic (H7), there is a spell called "fire guardian." We can create something similar to this fire guardian (a similar concept, not the original, because we don't have fire magic in H5, and there are no fire spells that don't hit an area – area spells affect our own units, while a guardian is uncontrollable). Therefore, it will not be a "fire" guardian, but a "magic" guardian (it will attack with the "explosion" spell).
What don't you like about chaos magic – it's essentially ice and fire magic?
If I'm not mistaken, there is a skill in the 5th game called: fire warriors.