Sworn enemy.

But there is no acceleration, right? It was also mentioned. I know about the stone skin of the druids.

Well, finding acceleration isn't a problem even without the School of Light (by the way, the conversation wasn't about acceleration yet; it was about rooting). Let's take the Haste spell for attack.

You also need to be lucky with a sworn enemy. I don't think you can kill so many creatures of a certain race in 3-4 weeks that you'll have a choice.

Then, if we're talking "if," we can just not discuss this topic at all, because sworn enemies are really unpredictable. Let's consider the most likely scenarios.

For example, Furies and Djinns.

I agree with Furies, but we need to think more about Djinns. They have high initiative and are good damage dealers, so they can do a lot in just 2 attacks. I think the sworn enemies of the Academy are: Rakshasa, Mages, Djinns/Golems. I won't consider the option that you can also include Titans.

It's not worth making those with low HP sworn enemies, because they can be quickly defeated anyway.

I'm not sure about that either. The first type of Dwarf is dangerous, and if it's Ingvar, it's better to make them sworn enemies (and these little bastards always stand in a group with their troops, which is exactly what an Elf-Chaos needs). By the way, it's fun to beat Dwarves with Chaos, because they all huddle together for greater healing efficiency, which is exactly what an Elf-Chaos needs.