Portalglyph
The Portalglyph is an Artifact of Chaos. Even to the most learned scholars of the Ordo Malleus, the Portalglyph is something of a mystery. Its merest presence creates a small Warp Rift, through which Daemons can emerge into the Materium. The item cannot be destroyed, only sealed.[1]
Sources
- 1: Codex: Chaos Daemons (6th Edition), pg. 65