For me I love the magic Idea but then I notice my character would not be able to use magic I dont beleive Since he is a Lord of Oren, Henceforth I think there should be SCROLLS Which are very powerful spells that only work once and when I mean very powerful spells when you use a certain scroll a certain area to cast on a 100 arrows come down and rain upon them and by using scrolls anyone would be able use them but they are extremly Rare and expensive.
Scroll Spell Ideas
One powerful one could be a 10 by 10 area fire blast that cant be put out for 10 seconds etc!
Like I said the arrow storm
Maybe a Large bedrock holding area that goes under them like a sphere
and would completly incase them in bedrock after 30 seconds it wold dissepear replacing the dirt and stone etc and releasing the people inside I think it shoud be big enough to cpature a group of people also
Rapid fireballs would pretty much shooting TNT 3 or 4 times and destroys blocks since the scrolls are extremely rare it would be able to decimate a attacking force or if your attacking them would decimate the defenders!
A scroll that grants invunrability I am not sure if they should be able to attack back though
Finnally a Scroll that lights you on fire without hurting you! If anyone tuches you or you touch them they catch on fire (touching includes hitting them with fists swords bows etc) So would give you a big advantage during a fight