In terms of usefulness:
Rampart - Ivor, Aeris, Castle - Edrick, Tower - Josephine, Theodore, Inferno - Fiona. In general, it's good when you already have creatures of level 3 or 4 at the start.
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2 AmberSoler
I insist on conducting tests. If you find even one hero who wasn't offered Wisdom before level 13 in SoD, I won't argue anymore. But I'll ask for save files before each level-up.
Added 1 minute ago
2 garkin
It is offered, it happens. Around levels 3-4, the school of magic, and at level 6, Wisdom. You can check.
Well, she also has Necromancy, I think. Just like Vidomina.