HotA - General Questions and Discussions

A hero with resistance who uses combat magic and deals more damage to his own units than to the enemy's units – that's absurd. Period. There's nothing to discuss.

In general, yes, if his own units received more damage, it would be somewhat absurd. But with the new resistance, that's not the case. The damage dealt is the same to both his own and enemy units.
The new resistance only affects the enemy hero, not the creatures on the battlefield. It also doesn't affect his own units (they are affected by the enemy's resistance, which reduces damage regardless of who the target of the spell is, his own or the enemy's – it simply reduces the spell points throughout the battle, and that's it). Mechanically/in terms of the interface, its property is simple and clear (if you don't try to connect it to the old resistance property). In terms of atmosphere, I wrote some justifications above and acknowledged that, nevertheless, it still makes sense to work on the name and icon.