Skills for an Inferno hero.

The connection between distraction and artifacts affecting initiative can be observed: the enemy hero moves less often, while the creatures move more often, meaning that the troops get more turns before a debuffing or damaging spell is cast on them. Slowing artifacts work on a similar principle, but with the demon hero and enemy troops, and vice versa. By the way, considering the demon's knowledge and decent combat stats, you can take Counterspell, effectively trading your hero for the enemy's. This is especially useful if the hero focuses on magic.

And in the late game, you can create very, very unconventional heroes... When you have a lot of money and a bunch of different cool artifacts... A demon mage with two magic skills (which, by the way, don't require a huge amount of mana) still looks decent :) And if such a demon is wearing "Divine Vengeance" and also has Enchantment...