Side note: in games like D&D character leveling COMPLETELY undoes the Narrative validity of the Big Bad they're trying to defeat.
big bad: "I've spent my whole life training and gathering power for my evil dominion! Muahahahah"
PCs: "Huh. We were typical peasants a week ago, but then we spent a week murdering kobolds in that dungeon over there and now we can kick your ass. 🤷♀️"
GhostOnTheHalfShell