Vial of the Immortal WellspringEquipment 20
Source Pathfinder Dark Archive
Weight negligible
At a wellspring, you gave your blood to a force of nature and received a vial from the wellspring's heart in return. Once per 10 minutes, when your dying value would increase above 3, you instead become Unconscious and are no longer dying; this doesn't prevent you from being killed by death effects or the doomed condition. Once per day, from any distance, the entity that holds your bargained contract can possess you and control your actions, leaving you unaware of what goes on. This possession automatically succeeds, regardless of any countermeasures you might take. Normally this lasts for only 1 round if during an encounter, or no longer than a few minutes during exploration. However, the more you rely on the power of the wellspring's heart to survive death, the longer it can possess you the next time it chooses to do so, doubling the amount of time with each use, to a maximum duration of 1 day. Once the entity possesses you, this duration resets.
Activate 
command
Frequency once per day
Effect You drink from the vial of water that seals your bargained contract. You gain the effects of a 9th-level, 2-action Heal spell.
Traits
This rarity indicates that a rules element is very difficult to find in the game world. A rare feat, spell, item or the like is available to players only if the GM decides to include it in the game, typically through discovery during play. Creatures with this trait are rare. They typically can't be summoned. The DC of Recall Knowledge checks related to these creatures is increased by 5.
ContractA contract is a type of item that magically establishes an agreement between multiple parties and typically grants magical benefits.
InvestedA character can wear only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.