rebellious
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That's just unfair. You learn an entire skill (spending a skill slot and experience points), and you might even plan the tactics for the upcoming battle – and then this (((. Some artifact overrides an entire skill and everything associated with it.
The effect of the black orb is quite tolerable and not as devastating as the effect of the red orb (Sphere of Suppression) and the Cloak of Negation. These artifacts can negate a good half of a hero's skills and abilities – wisdom, all schools of magic, intelligence, resistance, witchcraft, and finally, the magical specializations of heroes.
And there's another artifact that does a lot of harm – the Badge of Courage, which, in addition to adding +1 to morale, protects your troops from mind control spells. Moreover, when you try to cast Berserk on an opponent, you will see the animation of a book with a wand, i.e., the possibility of casting the spell is shown. But when you aim this book at the target unit, a turquoise outline will not appear around it, i.e., an indication that the opponent has the Badge of Courage. So, don't cast Berserk – you'll waste mana and the cast itself will fail.
The possibilities of using these three artifacts could have been mentioned.
