What the game says, what really changes when you play, and the code to unlock it. Steam says 4.6% of players have it.

Artifact of Devotion
Game text: «Replace broken drones with Lemurian Eggs. Offer an item to gain followers.»
Broken drones are replaced by Lemurian Eggs. Offer an item to an egg and an allied Lemurian hatches carrying that item; with more items it evolves up to an Elder Lemurian.
An army of Lemurians that grows with what you give them. Each can carry several items; give them your spare whites. It arrived with Seekers of the Storm.
It arrived with the Seekers of the Storm expansion. 4.6% of all Risk of Rain 2 players on Steam have it, from Steam's public stats on 31 October 2026.
Read top to bottom, as shown here: three rows of three shapes. Each slot on the generator changes shape when pressed, in this order: square ■, circle ●, triangle ▲, diamond ♦.
In co-op, the group can enable any artifact that any player has unlocked. Artifacts are chosen in the menu before the run starts.
Enter its code (▲♦▲ / ■♦■ / ♦▲♦) in the Compound Generator on Sky Meadow or Helminth Hatchery, use the laptop and beat the Bulwark's Ambry trial: take the key and break the reliquary.
Broken drones are replaced by Lemurian Eggs. Offer an item to an egg and an allied Lemurian hatches carrying that item; with more items it evolves up to an Elder Lemurian. An army of Lemurians that grows with what you give them. Each can carry several items; give them your spare whites. It arrived with Seekers of the Storm.
4.6% 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).