Hyper-Efficient Metabolism (3.5e Feat)

Upon taking this feat you gain a +2 enhancement bonus to one physical and one mental ability score of your choice. At 7 HD and each odd HD afterward you choose an additional physical or mental ability score to receive this bonus (up to 13th were all ability scores are increased). At 8 HD and each even HD afterward you choose one ability score that received a +2 bonus enhancement to become a +4 enhancement bonus (Up to 20th were all ability scores are increased). At 16th HD and each even HD afterward you choose one ability score that received a +4 bonus enhancement to become a +6 enhancement bonus (up to 26th were all ability scores are increased).

Additionally you may incur a single bio-energy point drain to increase the enhancement bonus to one ability score by +4 for one minute as a swift action. If constitution is chosen you do not get additional bio-energy points. This ability can only be used once per minutes.

Epic Level: Upon reaching 25 HD the enhancement bonus on all ability score increase by +2 (up to +8 on each ability score), this happen again at 30 HD (up to +10) and 25 HD (up to +12).