True Wish

True Wish is the mightiest spell in existence. Unlike most other spells, True Wish cannot be cast using normal means, and instead requires the power of a magic item or god to be cast. True Wish essentially gives the caster the ability to reshape one aspect of the multiverse to their will, with but a few rules:

• Using True Wish, you CAN destroy any magic item, including artifacts.
• Using True Wish, you CAN do things that state that nothing "save the power of X or Y can undo this". However, using True Wish, you CANNOT do things that EXPLICITLY state that True Wish is powerless to change.
• Using True Wish, you CANNOT become the dungeon master, nor can you learn their plans.
• Using True Wish, you CANNOT do things that would affect other campaigns, such as making a character in the other campaign you attend level 20.
• Using True Wish, you CANNOT change the rules of True Wish.