Yes, I overlooked that. There's just a formula for a curse word.
But Hell Wave hits all non-demons, and it's stronger than Unholy.
And there's a mana bug: it doesn't get consumed when using the wave.
Several people are already coming up with ideas for Hell Wave.
I tried to maximize the sorcery skill on a test map, but the damage from Hell Wave is still much lower than from Unholy.
And regarding Kha-Beleth, in my opinion, he should be a powerful magical hero, but it turns out that he has little sorcery skill, and the specialization doesn't really suit him.