Boss item (yellow). What the game says, what it really does, what each copy adds and what it pairs with.

Pearl
Boss item (yellow)
10% more max health. Each extra pearl, another 10%.
Game text: «Increases maximum health by 10% (+10% per stack).»
Stacking: Each copy adds the same, no cap.
Watch out: Not from printers or recyclers: only Cleansing Pools or a Shrine of Order.
It has a void version: Newly Hatched Zoea. Pick that up and every copy of this item turns into it.
| 1 copy | 2 copies | 3 copies | 5 copies | 10 copies |
|---|---|---|---|---|
| +10% | +20% | +30% | +50% | +100% |
Each copy adds the same.
max health: Growth.
more health, more shield.
Dropped by a teleporter boss: each green item it drops has a 15% chance to be this one.
Unlocked from the start: it can show up in any run.
10% more max health. Each extra pearl, another 10%.
Stacking: Each copy adds the same, no cap.Watch out: Not from printers or recyclers: only Cleansing Pools or a Shrine of Order.
Dropped by a teleporter boss: each green item it drops has a 15% chance to be this one. Unlocked from the start: it can show up in any run.
Sources: the game's English text (name and description), the Risk of Rain 2 wiki (riskofrain2.wiki.gg: this item's page, read on 31 October 2026; numbers, stacking formula and notes) and the wiki's survivor pages. The plain-words text and the synergies are ours. Icons: Risk of Rain 2 (Hopoo Games / Gearbox).