Star Wars: A Flicker of Hope
Your natural regeneration can help you recuperate from wounds more quickly.
Prerequisite: Trandoshan species.
Benefit: Once per day when you catch a second wind, you can regain no hit points immediately and instead regain 5 hit points at the end of each of your turns until you reach full hit points or until the end of the encounter (whichever comes first).
Source: Rebellion Era Campaign Guide, p. 35.