Keeng Ra'at is a large albino mole-rat with an enlarged braincase. He is similar to regular mole rats, but much smarter and capable of speech. He can be found deep underground in the rat infested caves beneath Klamath and seems to be able to control an army of smaller mutant rodents.
He has a brother - Brain, who is less aggressive towards humans. Killing Keeng Ra'at makes his brother comment on it when met, he will not attack in revenge as he knows Keeng Ra'at was insane.