StreamOfTheSky
Adventurer
The problem with making your own epic spells isn't just that several are stupidly broken, and it's way too easy to cheese huge spellcraft modifiers. It's also the disparity between them. Hellball is utterly terrible. I probably absolutely wouldn't want it as a level 9 spell, let alone epic with massive spellcraft DC. On the other hand, you can use epic spellcasting to add +50 (or whatever number you can make the spellcraft check for) to your casting stat.