kiko
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On the 5th level, resurrection, and on the 4th, it's the perfect place for regeneration, IMHO.
But I want to point out that in some cases, applying resurrection (on the 7th level of troops), which, as I understand it, will last for 4 turns without reducing the maximum HP, is significantly more beneficial than "resurrection."
So, I think: at least the 4th level.
Added 1 minute ago
and this will significantly change the essence of the spell - reduce its importance
