Keren is found standing beside Crimson's cage in the Circus of the Last Days, at X: -57 Y: -34. They will reveal a violent streak if spoken to, and declare that they wish Crimson would eat the fingers of any children that get too close to his cage.
Tampering with the cages, including unlocking and opening them, will turn Keren, Dribbles and Rylandtemporarily hostile if detected.
Combat
Attacks and abilities
Keren has the statistics, attacks, and abilities of a generic doppelganger. When the party engages Dribbles in combat, Keren will spend their first turns unlocking the animal cages, unless the creatures were previously freed or pacified.