So, I understand your intention correctly – to transfer the perk to Light? If so, then the question about the Shield school is removed (after all, this is about leveling up, not magic).
In HotA, Darkness for the Warlock and Summoning for the Elf look great, but there are also many changes in the spells. So, the question boils down to the spells. It is quite possible to make Darkness beneficial for the Warlock. However, this is already a topic for a separate project.
The fact that the Elves will become "similar" to demons is not an argument. Demons have a lot of mana and little attack points, while the Elves have the opposite. With all the consequences. In addition, it will not be possible to avoid repeating schools: for 7 races, there are 6 combinations. In the original, the Dwarf repeats the Elf.
It's another matter that if you give the Elves Darkness + Chaos, then Chaos + Summoning must be given to someone else. The first candidate is the Mages (and they don't need Light anyway, as mini-artifacts already enhance them). Accordingly, Light + Summoning is freed up from the Mages and goes to the Elves, or to the Dwarves.
For now, these are the ideas. A total of 3 permutations, but Darkness remains in its place.
This is the only thing that unites them. But the goal of your project was to move away from leveling up useless perks for the sake of useful ones. So, I think "Resilience" is useless if I want to switch to "Evasion" (the perks solve fundamentally different tasks).
Suggest an alternative, where to put Evasion?
Added 6 minutes ago
I have an idea for the Elf: make Summoning native instead of Chaos, and get the necessary chaotic spells from leveling up (put them in the Elven schools). Or even simpler: give chaotic spells to heroes at the start. That is, in fact, play with 3 native schools (but without leveling up in Chaos).
SE: I will return to the cities then.
The idea is that the player can choose the city class. One class can be given Summoning and Light as native, and another can be given Chaos and Light. Give a little more percentage chance for Summoning to appear. There is no problem :)
The classes work perfectly - I just checked.
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