The withrren is a common creature throughout much of Sena's northern hemisphere, where it lives in extensive burrow systems amongst others of its kind. It is a basic beast class creature, having the form of a terrier dog mixed with a badger. Most are grey in colour, although brown, black, and very rarely white individuals have also been observed. Withrren are omnivorous, but have little fear and will team up to take down prey many times their size by grabbing hold and weighting them down in numbers. A withrren's jaw has a unique locking mechanism that prevents it from opening against the creature's will without breaking, helping it hang on no matter what.