I made it a psionic feat requiring concentration checks for my variant Psionics system:
Autohypnosis
You have trained your mind to gain mastery over your body and the mind’s own deepest capabilities.
Prerequisite: Con 13+, Int 11+, Concentration (4 ranks), Threshold
Benefit: You can make concentration checks in order to ignore wounds, resist dying, tolerate poison or improve your ability to resist fear effects. You can spend focus points to increase your check result, each point spent increases the result by 1; you must choose how many points to spend before making the check.
You can ignore wounds from a spell like stone spikes or caltrops, if the effect was magical or psionic the DC is equal to a the save DC of the spell or power instead.
Stabilization allows you to stabilize when reduced to fewer than 0 hit points. In addition to a stabilization roll you can make a concentration check once per round, the DC is equal to your negative hit points +10. You may choose to make this check before or after the stabilization roll.
When you tolerate poison or resist fear you use your check in place of your saving throw if the check is better.
Code:
Task DC Threshold
Ignore Wound 16* 2 focus points
Stabilize -hit points+10 3 focus points
Tolerate Poison Poison's save DC half your focus
Resist Fear Fear's save DC half your focus