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The spell cannot be cast on a completely healthy enemy unit.
Why is there such a restriction? How will this be taken into account in the game? For example, if I try to cast a spell on a healthy unit despite the restriction, what will happen? How will I be informed that it won't work?
Справедливость превыше всего, но милосердие превыше справедливости (Ольга Брилёва)