Say a player is level 6 and faces a level 10 monster, the player decides to play a one-shot +5 card, making the player level 11. After that card is played, another player enrages the monster making it level 15.
The player in combat cannot defeat the enraged monster and is forced to run. Does the player have to discard the one-shot item, even though it was not used to defeat the monster?
Seems to make sense that the player must discard all one-shot items played even if they were unsuccessful. However I do not believe this was specifically covered in the rulebook.