Wisdom Breeds Caution( Underdark, p. 27)
Not getting into a dangerous situation is generally the wisest course, but if danger is unavoidable, you're prepared. You rely more on caution and forethought than you do on physical prowess.
Slyth or svirfneblin,
At 1st level, you may use your Wisdom modifier instead of your Constitution modifier to determine bonus hit points. At each level thereafter, you use your Constitution modifier normally to determine bonus hit points, but you also gain +1 hit point for every point of permanent Wisdom you gain.
You may take this feat only as a 1st-level character.
Your Constitution modifier determines your bonus hit points at every character level.