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I agree with some points, but not with others. Instead of "spells... affecting... the mind," you could write "mind spells," "spirit spells," or "life spells" – especially since they have descriptions. The problem is that mixing Russian and English words in one sentence doesn't flow well. It might work if it were something like: "... mind-affecting spells (mind spells)...", but that's too cumbersome.
Техника в руках индейца мертва.
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html