Rat Upgrade: Basic Ratlantean is a Rat Upgrade with no unique abilities, rather it is used as a crafting ingredient to make more advanced Rat Upgrades.
Crafting[]

Rat Upgrade: Basic is crafted with 4 Emerald and 4 Marbled Cheese. Like all Rat Upgrades, it can be applied to a rat by placing it in the upgrade slot in the Rat Menu.