Temp HP — Temporary Hit Points
An extra buffer of health that is used up first when you are hurt, and cannot be healed back.
Temporary Hit Points (Temp HP) come from spells and abilities. Damage takes them away before your real Hit Points (HP). They are not restored by healing and usually do not add together.
In Fantasy RPG
Fantasy RPG: temporary hit points are lost before real ones and do not stack. If you gain more, keep the higher number.