Azure Toughness

(Magic of Incarnum, page 35, DnD 3.5)

[Incarnum]

You can use incarnum to boost your physical vigor.

Prerequisite

CON 13

Benefit

Once per day, you can invest essentia into this feat. You gain three temporary hit points per point of invested essentia. Once the amount of essentia invested is chosen, it cannot be altered and remains invested for 24 hours, even if the temporary hit points are lost. You gain 1 point of essentia.

Special

Azure Toughness can be used in place of the Toughness feat to qualify for a feat, prestige class, or other special ability.