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I came across this sentence while playing Fire Emblem: Three houses.
時を巻き戻す力、おぬしにも使わせてやる。 際限なく使えはせぬゆえ気をつけよ!
ソティス explains that the player can rewind time to fix mistakes and change strategy. I think she says something to the effect of "I'll let you use the power to rewind time. You can't use this ability endlessly so be careful!" but I'm not sure.
What does 「使えはせぬ」mean in this passage?
せぬ is せ+ぬ. せ is the pre-nai/negative form (未然形) of す, which is an archaic form of する. ぬ is an auxiliary verb corresponding to the modern ない. So, せぬ is equivalent to しない.
Thus 使えはせぬ is an archaic form of 使えはしない, meaning (you) cannot use (unlimitedly).
