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'''Activated Vessels''' are human cultists , [[Vessel]]s that have let themselves be overtaken filled by a [[demon]]ic presence, distorting them to into a dangerous vaguely human-looking creature mutated monster of great power. Activated Vessels are [[demons]]. Cultist summoners can be found alone, but are often encountered in circles of five or more individuals, all of whom are working actively to surrender their lives and bodies to a possessing demonic power. Players are well-advised to kill as many of the Vessels as possible, before they can call down a demon and become a more dangerous Activated Vessel. The death animation for such monsters is delightful, with the monster stopping and shuddering as the demonic spirit leaks back out, before the corpse detonates in a spray of gore.

}} [[ImageFile:Mon-activated-vessel-conD3 Vessels.jpg|thumb|left|150pxthumb|Artwork showing an Activated Vessel concept art, showing "[[Teeth of Diablo]]".]]These creatures are what [[Dark Vessel]]s transform into, if they successfully summon a demon into their own bodies. Activated Vessels are mutated, half-demonic things who fight furiously and move very quickly. It's a good idea to kill off the Dark Vessels before they can activate, if at all possible.

The spikes that pokes poke out of their backs are called "[[Teeth of Diablo]]", and are indeed a metal spike inserted into the flesh of the willing recipient. The spike does not seem to cause internal haemorrhaging but instead some sort of perverse corruption of both soul and body.