Skills for an Inferno hero.

Generally, the most useful skills for demons are "gate opening," "attack," "chaos magic," and "summoning magic." :smile20:

Chaos magic isn't very useful – it helps a little at the beginning, but then it becomes increasingly useless...
A demon is still a combat character, so it's better to develop skills in light/darkness or, at worst, summoning!
Attack and luck are undoubtedly good choices.
Instead of light, you can take speed from attack and stone skin from defense, but mass blessing on hordes of demons or punishing strike is very appealing – after all, demons usually attack first!