From Brotato Wiki
Item
Barnacle is an in-game item that can be bought from a Shop or can be found in a Crate. Most Items modify the Stats of the player, and some of them provide additional effects.
Unique
Barnacle is a unique item. Only 1 of each unique item can be equipped, and it will then no longer be offered in the Shop, and no longer drop from loot crates.
Notes
Barnacle increases the stats given by Upgrades, similarly to 
Captain. The increased amount will show up directly on the upgrade. So a Tier 3 Armor upgrade will show up as +4 instead of +3. Still the Purple color.
It also gives +1 Curse
When leveling up. This can either be considered a positive bonus, or a big downside depending on your build and opinion on the Curse stat.
Since Barnacle gives value upon leveling up, it is better the earlier you get it. You can get even more levels by buying XP Gain items.
- Upgrade Values are rounded down. So picking a 2 Armor upgrade doesn't give you 2.7 Armor. It just gives 2 armor.
- Barnacle stacks Additively with the +100% from Captain for at total of +135% upgrade stats.
Update History
- 1.1.0.0: Added to the game.