Temporary Hit Points

From Talus Wiki

Certain effects give a character temporary hit points. When the temporary hit points expire, the character's hit points drop to his current hit point total. If the character's hit points are below his current hit point total at that time, all the temporary hit points have already been lost and the character's hit point total does not drop further.

When temporary hit points are lost, they cannot be restored with healing as with real hit points.