<garkin>
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In my opinion, a Power of 20 would ensure that the spell lasts for 20 turns, which is enough either until the end of the battle or until the climax (when the spell's effect is no longer needed).
And the slots occupied by the ring can be used for more useful artifacts.
Although, of course, I haven't seen the situation you're talking about.
Плоды размышлений были съедены червями сомнения...
