Try this strategy. I played for the first time and went through the 15th floor with ease
use Necromancer for subrace and draconian or Atlantian for main.
now each time you level up put it only on will and intellect. find items which gives you stamina.... just keep summoning your skeletons before any encounter then support them by firing spells from behind. be careful in shooting your spells because your skeletons can be damaged as well. Just repeat the strategy over and over until you passed all the badges or finished the game..
I hope this helps
it's very easy to lvl .. just put all you skills in exp, attack, def, agility...
then turn on the twilight mode, blind mode and no magic... .
this is ok for high leveled players