Acorn
Acorn does nothing useful until an egg is following you. It is a pet-route item, not a weapon.

I would skip this in a run with no egg and take it the moment an egg is already trailing me. The bullet block is the whole published effect.
Effect
The 1.4.6 line says your eggs can block enemy bullets. It does not say the egg is destroyed, and it does not give a block count. I am not adding either.
Item Fields
| Field | Value |
|---|---|
| Effect | Eggs block hostile bullets |
| Required resource | Following eggs; pet evolution is a separate event |
| Source reference | Fandom Items; Fandom Pets |
Related Mechanics and Evidence
Acorn uses eggs to block hostile bullets. Cookies pays out after a pet evolves. These cover different stages of the egg/pet route; no survival rate or Bomb-farming yield is established.
This comparison is an editorial interpretation of the cited mechanics, not an official combo test. Unknown numerical values and unlock tasks remain unknown.
| Field | Value and scope |
|---|---|
| Related item / system | Chocolate Cookies: Acorn uses eggs to block hostile bullets. Cookies pays out after a pet evolves. These cover different stages of the egg/pet route; no survival rate or Bomb-farming yield is established. |
| Source | Fandom Items (https://neonabyss.fandom.com/wiki/Items); Fandom Pets (https://neonabyss.fandom.com/wiki/Pets); Fandom Chocolate Cookies revision 5273 (https://neonabyss.fandom.com/wiki/Chocolate_Cookies?oldid=5273) |
Questions this page answers
What does Acorn do?
Eggs can block bullets fired by enemies.
Do I need a pet first?
You need an egg. Pets hatch from eggs after combat rooms, which is a separate wiki page.
Keep going
Sources
- Fandom Items — B: Item table, wiki version 1.4.6, CC BY-NC-SA.
- Fandom Pets — B: Egg and pet rules. Wiki rightsinfo: CC BY-NC-SA; independent mechanic facts, no commercial copying permission.
- Fandom Chocolate Cookies revision 5273 — B: Historical passive-item record; fetched 2026-10-14. Independently restated facts, not a reproduced article. Wiki rightsinfo: CC BY-NC-SA; independent mechanic facts, no commercial copying permission.