rumen FAYE* — (1) A creature, or (2) a similarly named organ of that creature. Rumen is 

1. an alternate term for → rumenati and

2. an organ specific to rumenati that collects the blood consumed by rumenati. It holds the blood until it is needed for nourishment, at which point it is regurgitated into the mouth and swallowed into the stomach proper. Blood can be stored in the rumen for an indefinite amount of time.

* Rumenati origins are unclear, though their physiology appears to be biological rather than magical. However, given their uncanny “powers,” they are loosely considered → faye. This is only marginally true, since faye tend to be of a more natural order.