Posts from Skills for an Inferno hero. Auto-translated

3. Once again, the developers' dismissive attitude towards demons is confirmed. I'm talking about the "Will of Urgash" set. The description says it adds 25 percent. Logically, it should be 40+10+25 = 75. In reality, we have 40+10+2.5 = 52.5 percent. And then it linearly adds 2.5 percent, meaning that even with 6 castles, the bonus will be 15 percent, and it will only reach its promised value of 25 percent with 10 castles, which is never going to happen.
In other variations, there are nuances (I'm not a mathematician, I can't derive an exact formula), but in any case, the percentage is negligible.
It's even more frustrating, considering that the developers' favorites, the Dark Elves, have a set that works as intended, with a strange name, "Power of Runes," which quite effectively doubles the damage from chains, and no one is complaining about it being overpowered.
After testing, I would rank the demon set as last or second to last (I don't like that the barbarian set reduces initiative), as 5 attack points are more useful than gating.

The developers messed up in many places, including the necromancer's set. In general, I've already found a ton of bugs and unfinished features. In short, they abandoned the game prematurely and didn't finish it.

As for the set, it gives a 25% bonus, but it doesn't apply to the racial skill (the percentage from opening gates), but only to the special ability of Nimue, the Gate Lord, and the Chaos Gates in the castle. That's why the numbers are so strange and don't add up to 25% in total. However, if a successful gating occurs with the set, the racial skill is already calculated as an addition to the successful gating. For example, it will give an increase to a successful gate, not 40% on skilled gates, but 50%, that's the kind of thing it does.

Regarding the difficulty of the matchup between races, it's all murky at different stages of the game, but as for the Elf... The last time I played this match, I was testing the AI, meaning we agreed to play specifically against the AI, and everything else was as usual. And in this battle, the AI demon beat the Elf. True luck plays well even against the Dark Elf, for example, his berserk archers were successfully killed by the knights or dryads, I don't remember exactly).
But I agree about the mages, it's a very annoying race, although not just for the demon.

Everything except magic, summoning, and chaos.