Fleshreaver

“

Fleshreavers are horrible, fleshy monsters with an unusual method of evolution. A young fleshreaver is born as barely more than a small skeleton; the parents assure the survival of their young by layering muscle, tissue, and flesh over the delicate newborn.

Sewn together by older fleshreavers, they use only the finest musculature and bone from prey to flesh out the body and wings of their young, carving horns from the discarded bone fragments. Once a fledging fleshreaver has been fully created, it must continue the handiwork of its parents, acquiring new flesh pieces and better musculature to attach to its skeletal structure in order to supplant its rapidly growing form.

— The Guild Wars Eye of the North Manuscript

The Fleshreavers are creatures that resemble the undead but are still living. The only ones seen in the game are either being trained by the charr found in Rragar's Menagerie, or are in the Heart of the Shiverpeaks.

List of hostile NPCs

The Guild Wars 2 Wiki also has an article on Fleshreaver.

Region	Name	Trophy
Guild Wars Eye of the North
Depths of Tyria	20 (26) Fleshreaver Hound 20 (26) Fleshreaver Harrower 20 (26) Fleshreaver Nephilim	Fleshreaver Morsel