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Source: Player's Guide to Faerun

Description: Your can store more spellfire energy levels than normal.

Prerequisites: Epic Level, Endurance, Spellfire Wielder, Concentration (20 ranks)

For the purpose of determining your limit of stored spellfire energy levels, treat your Constitution score as if it were 4 points higher than it is.

Special

You can select Epic Spellfire Wielder multiple times. Each time you take this feat, your limit of stored spellfire energy levels increases by 4.

Normal

Without this feat, a spellfire wielder's limit of stored spellfire energy levels is equal to her constitution score.