i think this is a lil bi a fail build. but many are right

1. i dont think that he is a knight. so he cant get 15+ skill points.
2.i would no max energie hammer because he got enough nautral skill
3. i would preffer max thunder spear & element master because that do more dmg ( thunder spear because you will take mby light gem 5%..... better are 57 mag. dmg+ but to expensive for you i think ^^)
and ofc all element because all of the elements got negative and positiv sides
( 51 fire/light/ice skills got a nice range if he will run away from you )