Sigil of the Fiend

Description
"The man at the foot of the sarcophagus leaned over it and moved his candle as if he were writing with a pen, inscribing a mystic symbol' in the air."

- The Hour of the Dragon

When the Maelstrom grew out of control, shimmering across the multiverse and summoning creatures from beyond this world, the Elder Races retreated to their vaults. This voluntary exile gave them time to research and prepare weapons with which to fight the things from beyond.

This Sigil is the result of this research. Using this Sigil provides a person with an otherworldy trait for a while - in this case preventing them from losing other sigils that they have in effect.