Some more abilities, some creative, some more stereotypical rpg fantasy, because I just haven't thrown enough words at you yet:
Trail of Fire: Leaves fire path behind player as they walk (hopefully self-explanatory), alternatively
Fire Dash: A charge that leaves a line of fire in its wake (could forget this and have it work as a synergy Between Trail of Fire and Bull Charge/phaseshift/lunge etc)
Ice Cage: Will freeze enemies inside its path and block those outside. Can be knocked down with attacks and slowly melts.
Geomancy: Pull a set of walls towards player, then away from player, damaging enemies in the path. Or maybe pull a wall from a location into the ground and reposition under target, crushing enemy if under ceiling, throwing them into the air and repositioning in random location if outside, dealing damage in either case. Trying to think of some others like these that aren't too obvious for a potential earth/magic based pseudo-category. Generally they're difficult to envision based on how selecting abilities and targets work, is it possible to select multiple targets in a queue or sequence for an ability?
Telekinesis: That sword over there? Mine now. Pull items from a distance towards player, damaging entity if in its path. Partly inspired by D2 and one of my favorite C:DDA synergies, "Magneto" setup of bionics making it possible to magnetically pull metal objects into the player's hand and fire them at enemies with the strength of a gauss rifle. Not sure how something going anywhere near that would fit mechanically but it would be entertaining to throw items not located on the player at enemies somehow. I see issues handling how items stack and players selecting individual items versus the entire pile.