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Source: Epic Level Handbook

Description: Choose one of your spells or spell-like abilities. That magic cannot be dispelled, only suppressed.

Prerequisites: Epic Level, Spellcraft (15 ranks)

Choose one spell you know or spell-like ability you possess, such as Improved Invisibility or Stoneskin. Whenever the chosen form of magic would otherwise end due to a dispel effect, the magic is instead only suppressed for 1d4 rounds. The magic still ends when its duration expires, but the suppressed rounds do not count against its duration. You can dismiss your own spell or spell-like ability (if dismissible) or dispel your own tenacious magic normally.

Special

You can gain this feat multiple times. Each time you take the feat, it applies to a different spell or spell-like ability.