first of all
RTFM (read the ■■■■■■■ menu)
then cheat, get everything you desire according to what you learnt by RTFM
play a MAGE, solo him, get every freaking spell there is, cheat your way through
after one run, go back, start from normal
remember: NO PAUSE, HARDEST level
once you cheat your way out, you'll understand everything, the next step is to restrain yourself from cheating... a little bit hard, but I did it