Attrition

Fifth of Ars Conserva (The Art of Conservation) - Spell Series

The gem binds your soul to your body for the duration. It must remain on your person, but does not need to be exposed. If the gem is destroyed by any means, the spell ends immediately.

Until the spell ends, you remain conscious and able to act, even while at 0 hit points. While under this effect:

• You are still considered to have 0 hit points, and you continue to make death saving throws at the end of each of your turns as normal and when taking damage.
• If you fail three death saving throws, you die. If you succeed three, you are stabilized.
• You cannot benefit from healing or temporary hit points. Any attempt to do so breaks the gem.
• If the spell ends for any reason (such as loss of concentration or being dispelled), you immediately fall unconscious at 0 hit points and resume normal death saving throws.
• You can only cast cantrips and take non-magical actions. Attempting to cast a spell of 1st level or higher breaks the gem.