Gravity Magic

Gravity Magic allows to manipulate gravity, lower weight of objects and limited levitation. It also possess quite a few debuffing spells that force enemies to advance in the direction opposite to gravity... which would normally make it impossible to reach the target, if not for a few significant disadvantages. You can't really cast this spells on certain target, more like on a certain area (which can be dodged or avoided).
What's even more important, it is impossible to make a gravity field that is simultaneously big, stable and on a wide area. It's either weak and only slows down (but it stays for long and on a wide area), stops enemy totally but quickly dissipates (although it works on a big area) or its strong and stable, but works only on a very narrow area, better to deflect arrow than stopping mortals.