Rapid Regeneration (D20 Modern Feat)
From D&D Wiki
Rapid Regeneration [Power]
The character regenerates faster.
Benefit: Once per round while under the effects of the Regeneration power, a character may choose to make a Regeneration check against a DC equal to her current HP. If she succeeds, the Fast Healing gained from her power increases to 5 for the rest of its duration. For evey 5points above the DC the Fast Healing increases by 1.