What the game says, what really changes when you play, and the code to unlock it. Steam says 10.3% of players have it.

Artifact of Rebirth
Game text: «Descend to Petrichor V with gifts from a previous life.»
You start the run with the item you offered to the Shrine of Rebirth in the previous run. Without it active, the shrine gives you nothing.
It has no code. It unlocks with the Experienced Rebirth challenge: offer an item to the Shrine of Rebirth at the end of Prime Meridian (Seekers of the Storm). The run ends there.
It arrived with the Seekers of the Storm expansion. 10.3% of all Risk of Rain 2 players on Steam have it, from Steam's public stats on 31 October 2026.
This artifact has no code: it is not entered in the Compound Generator.
It has no code. It unlocks with the Experienced Rebirth challenge: offer an item to the Shrine of Rebirth at the end of Prime Meridian (Seekers of the Storm). The run ends there.
In co-op, the group can enable any artifact that any player has unlocked. Artifacts are chosen in the menu before the run starts.
With the Experienced Rebirth challenge: offer an item to the Shrine of Rebirth at the end of Prime Meridian (Seekers of the Storm).
You start the run with the item you offered to the Shrine of Rebirth in the previous run. Without it active, the shrine gives you nothing. It has no code. It unlocks with the Experienced Rebirth challenge: offer an item to the Shrine of Rebirth at the end of Prime Meridian (Seekers of the Storm). The run ends there.
10.3% of all Risk of Rain 2 players on Steam have it, from Steam's public stats on 31 October 2026.
Sources: the game's English text (artifact name and description), the Risk of Rain 2 wiki (riskofrain2.wiki.gg: the Artifacts page and this artifact's page, read on 31 October 2026; code, Compound Generator and Bulwark's Ambry) and public Steam stats. The plain-words text is ours. Icons: Risk of Rain 2 (Hopoo Games / Gearbox).