Drain Recovery (3.5e Feat)
From D&D Wiki
Drain Recovery [Spelltouched]
You have been energy drained so often you can shake it off more easily.
Prerequisite: Must have suffered from Energy Drain by spell or monster attack at least once
Benefit: You can recover a negative level from energy drain in half the time, i.e. in 12 hours, and you automatically succeed at the fortitude save to avoid permanent level loss.