Portalglyph

When the mad mage M'kar created the Portalglyph, he did so to lure Daemons to his service. Alas, M'kar's plans seemingly went awfully awry, for though the Daemons spilled through the breach they returned home soon enough, with both M'kar and the Portalglyph in their grasp. The Portalglyph has been seen many times since. Its creator, on the other hand, seems to have vanished...

Source

 * Warhammer Armies: Daemons of Chaos (8th Edition)
 * Page 63.

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