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In fact, omniscience has another advantage: it saves space for at least one skill. Although this will only become apparent in a long game and only if you really need various machines with catapults, which is not necessarily the case... Yes, it's not very useful in multiplayer, but in general, special abilities are not very useful in multiplayer anyway. But for single-player, this skill is very, very useful, in my opinion.
In general, it is too difficult to level up to this skill due to the stupid randomness. Perhaps the most idiotic thing in the fifth game. Recently, I tried to take it for a demon. I chose Grok, as you can already take it at level 23. But I leveled up to 29, and they gave me a lot of unnecessary things, and in the "Logistics" branch at level 29, instead of "Surprise Attack," they offered a choice of two unnecessary perks, and that's it: choose one of them, but then the path to "Ur-Ghast's Call" is permanently closed to you. And no matter how many times I replayed, the result did not change.
Why did they even come up with this? Okay, randomness is randomness, but when there are still many things to choose from, and you are given a choice of only two instead of four, and all of them are completely unnecessary, hindering the correct development, this is just nonsense.
Added 5 minutes ago
1. Dwarves have a strong special ability (twice as strong as elves), but the path to it is just terrible. You need a lot of junk for it, and nothing useful along the way.
2. Elves have a better path, but the ability itself is much weaker. The perks are not the best.
3. Again, the perks are garbage. Darkness without mass casts (except for the beam) and attack without acceleration is somehow very sad.
4. Orcs have a very strong special ability at the beginning of the battle, but the path to it is again made of junk, and the crooked machines and the lack of retribution are disappointing.
5. Warlocks' special ability is not very strong in itself, but they have an excellent path to it. In general, all the perks are useful, which is surprising.
6. Necromancers have a slightly worse path (no mass mind control and no bald one), but in general, the special ability is strong, albeit a bit situational, and looking at the path to it doesn't make your eyes bleed.
7. Mages get 4 schools on artificial intelligence for a completely useless base of machines. They really lack mass casts, and without them, there is no full power of magic.
8. Humans have a weak special ability, and the path to it is average. In general, humans don't need a special ability.