The marsh haunt had dull, peeling, gray-green skin, camouflaging it in the swampy terrains in which it primarily lived. Its bipedal stance and skull set deeply between its shoulders gave its silhouette the appearance of a humanoid lacking a head. Marsh haunts would occasionally leave their swampy homes to scavenge and acquire small prey in civilized areas. While non-sentient, they worked in loose packs of two to eight creatures to ambush prey, with some of them using their Force powers to scare potential prey toward the rest.
- Darth Plagueis (First appearance)