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I tested the situation with Jelu. I gave him the following artifacts: 4 elemental spheres, 4 elemental books, a vulnerability medal, a wizard's well, a potion of life, and shackles. I couldn't manage to remove the sphere of prohibition. Interestingly, in the only empty slot for the sniper bow and crossbow, he adds the shackles. Also, I couldn't achieve the bugged troop merging, although I read that it's possible somehow. After capturing the sorcerers' or druids' hideout, he merges the snipers into one stack – 69993 units.
In general, Jelu is positioned at a radius and cannot reach any castle, so you can defeat him by taking all the cities, but then you won't get bonus angels in the huts.
Also, the author writes at the beginning that you should free Caitlin, as she can teach magic. But she has training instead of literacy :D