Temporary Hit Points (PSR Supplement)
From D&D Wiki
Other Dangers |
Sometimes an effect will give you temporary hit points, or THP. These aren't actual hit points; they're a buffer against damage.
When you have THP and take damage, your THP are lost first. Any leftover damage carries over to your normal hit points. If for example you have 5 THP and then take 7 damage, you lose all your THP, and then lose 2 normal hit points.
Because THP are separate from your actual hit points, they can exceed your hit point maximum. You can receive THP even while at your hit point maximum.
If you are at 0 hit points, receiving THP doesn't bring you back to consciousness, but they can still absorb damage and potentially prevent losing Tenacity.
Any THP you have last until they're depleted, until you finish downtime, or until the granting effect ends—whichever happens first.
Temporary Hit Points Don't Stack. While multiple effects can give you temporary hit points, they never stack. When two or more effects simultaneously give you THP, you choose which effect to keep, and must discard the others.