I would choose gravity.I can repel to push them far away along with making them hit objects, attract to get closer to the enemy and cancel out their long range attacks or increase their gravity potential so they cant move and break their bones slowly.
Elemental Powers I’ve wanted to do this kinda thing for a while now. Thunder would have a big reach over things and branch out. Fire would have a big AoE explosion and burn things to a crisp. Freeze would pierce foes violently. Casting would be that the first levels requires you to get closer for a short burst. If you charge it up you would get higher levels of magic at a safer distance.