Right now at that lvl. For every school. Resist dont usually help unless ur like jade. At that lvl is all about who can hit n kill fast.
But to make pvp much easier. I recommanded getting hades or zeus or poseidon with crit n damage gear The hat n robe and wand from tartarus. Shoes from crown. The ring n athane from cronus n gladiator.
Amulet is a mastery or devine but u probably dont got that. So maybe a big health giver.
And for wand. The wand from pharoah pack is anazing but idk if u buy packs much. At lvl 100 is 130 block n 75 crit!.
N spamung lorenaster spell is awesone. Also carry shatter n pierce. And shield till u have enough pips then do a combo attack with some 4 pips spell then spam judge at end
On my balance I just stock up on mana burn and when they get 5 or more pip I use mana burn and they lose their pip. Then when their health is low I would just do a judgment or multiple of them.