The fix doesnt need to be wish spells or true res scrolls but the game's whole vibe(if you go the hero path i mean) is a dnd fantasy setting where youre a hero trying to save as many people as you can. Not some 40k grimdark where the ending is revealed to be ash and nothingness it just leaves the ending kind of hollow. Even if the developers wanted to put an ending that isnt "happy" give me a final fight i cant win without dieing in the process.
