Shiverskins are ROUS that resemble naked mole rats.
Nimble escape: ROUS can take the Disengage or Hide action as a bonus action on each of their turns.
Rodent resilience: ROUS have advantage on saving throws against being frightened.
Blind burrower: Shiverskins gain blindsight out to 10 feet but are considered blinded beyond that range.
Colony mind: Shiverskins gain telepathy up to 30 feet, usable only with others who share their language.