How to develop through the skill wheel on the path to the ultimate ability

Rajah, hello! Long time no see!))) Anyway, Sylvans are a seriously underdeveloped faction. Before the special ability, you can only develop those heroes (from the Sylvans) who have a starting skill that isn't essential. That is, a skill that isn't needed for consistent success. I don't know what the developers were thinking, but they've disadvantaged almost all the heroes of this castle, which I really like! For those with luck, they gave them magical resistance (Lucky), but what's needed is soldier's luck! Thus, everything is ruined. You have to take other heroes, but there are either 2 of them or even just 1. In general, I haven't worried about it for a long time and I play using the Ballista. I recommend it to everyone!!! It's awesome! 2 attacks, with armor penetration and 2 magical attacks, consuming the hero's mana. Super, but you need to develop the knowledge skill well, otherwise you might run out of mana. Forget about luck and play using the Ballista! The skill is overpowered, but the path to it is narrow...

Added 1 minute ago

Why an add-on? I upgraded Marcela's super ability. True, then I looked at this monster, remembered that I would still have to fight it, and replayed.
It's also worth upgrading Agrael with the Call of Urgash. The other heroes in the campaign either can't, or they don't need it (and it can even be harmful).

Yes, everyone upgrades Marcela) but try it with the Elves, and even in multiplayer) I'll carve you a medal out of a potato if you can do it). I developed the ability for Demons, Humans, Necromancers, and Mages (it's easiest for these, in my opinion).

Added 2 minutes ago
And how can you not know how to use the skill wheel? I really don't understand! It's simple and clear!