At 10th level spells, casters can simply make 10th level versions of any spell of lower level, and you can make literally any spell you’d like. If you make it too powerful for your current abilities, and attempt to cast it, it kills you, and IIRC that’s one of the few ways to permanently kill an epic level wizard. We die all the time, have Contingencied True Resurrections prepared for every time you get in combat. They last for years so this can be done well in advance.
I believe that those are referred to in 5th edition as the casters that broke the weave of magic and one of them accidentally killed Mystra for a second or two.
Epic Level/ God Level Campaign.
3.0/3.5 had those rules. It was fun
At 10th level spells, casters can simply make 10th level versions of any spell of lower level, and you can make literally any spell you’d like. If you make it too powerful for your current abilities, and attempt to cast it, it kills you, and IIRC that’s one of the few ways to permanently kill an epic level wizard. We die all the time, have Contingencied True Resurrections prepared for every time you get in combat. They last for years so this can be done well in advance.
I believe that those are referred to in 5th edition as the casters that broke the weave of magic and one of them accidentally killed Mystra for a second or two.