Needs review
Source: Epic Level Handbook

Description: You can forge rings of epic power

Prerequisites: Epic Level, Forge Ring, Spellcraft (35 ranks), Knowledge (arcana) (35 ranks)

You can forge magic rings that exceed the normal limits for such items (as stated in the Epic Level Handbook and in the Dungeon Master's Guide). For instance, you could craft a ring of protection that granted a deflection bonus of greater than +5 or an item that required prerequisite spells of higher than 9th level.