Inscribe Epic Runes( , p. 136)
You can inscribe runes of epic power.
You can inscribe runes that exceed the normal limits (see Runcaster prestige class). For instance, you could inscribe a rune with a spell greater than 9th level, or a rune with a caster level greater than 20th. Even this feat does not allow you to inscribe a rune with an epic spell (see Chapter 2: Epic Spells in the Epic Level Handbook). Such magic defi es the power of the written word and thus cannot be scribed into runic form.