I remember reading a book from the Dragon Lance campaign setting where Raistlin was asked to pull of yet another high level spell. He said he couldn't do that. (he had obviously used his encounter/daily powers
). He was asked again, because his comrades were dying... He asked if it was really what they wanted - and they said yes. He managed to pull of the spell but was severely drained.
If my players come in comparable situation, I would be inclined to allow them to use a daily power twice in a day, but with a serious downside. For instance one quarter hp drained* for the next few days and a -2 penalty to everything the until the end of a second long rest.
*drained as in can't be healed with magic

If my players come in comparable situation, I would be inclined to allow them to use a daily power twice in a day, but with a serious downside. For instance one quarter hp drained* for the next few days and a -2 penalty to everything the until the end of a second long rest.
*drained as in can't be healed with magic