Different classes/excel at different situations. .melee sorc probably better at tran athulua than k3kba. For leveling before you get your uberskill which locks out spels cold/lightning is really good. Lightning gives warp armor and nova charge + thunderstone for bosses/mobs you dont want to melee like thornz aura. Cold gives badass pets with 25DR aura and flat defence through ice queen+ shatter the flesh which is good dmg and cc! losim is good for melee sorc too since she has such a quick attack rate.The passives are really key. At high level living flame is also really really good hp regen. This game takes a learning mindset for me, if you fail try to understand why so you can make some alterations. Trying different things is necessary to succeed.