Although the parasite (resembling a yard-long worm) has deteriorated to a stage beyond useful analysis, the effects of the process are evident. Circle and strafe the creature if in melee range.DNA structure indicates that this organism is a hybrid of a human host and a parasitic organism.Listen, you'll hear one before you see it.Rumblers are also vulnerable to Psionic Hypnogenesis and Imposed Neural Restructuring, as well as the effects of theStasis Field Generator. Be prepared to use a lot of ammunition to take one down. Since its form is mostly Annelid, it is particularly vulnerable to Incendiary damage, and reistant to Energy. Try and find a sniping position where it can't reach you, or it will rip you apart within seconds. The Rumbler is much faster than an average creature of its bulk.

Research performed on a Rumbler organ suggests that the body is designed to protect the hyper-developed, but unconnected brain for a further part of the life cycle. The resulting creature is essentially a fast, tough, aggressive biological killing machine. However, the brain stem atrophies, and all control is provided by the cells of the body. In this stage, dense musculature grows all over the body, and the body undergoes massive development in all physical attributes, becoming a hulking humanoid monstrosity. Discernible human elements are minimal above the DNA level. This organism marks a further evolution of the first-stage Annelid Hybrid. If you have Research skill and some Molybdenum, you can research a Rumbler Organ to get a damage bonus against them. Rumblers first start showing up late on the Recreation deck, and are seen throughout the rest of the game.

A Rumbler is a Hybrid that has mutated/matured further.

System shock 2 rumbler art