The Zigg'raugglur is a mysterious fourth dimensional alien being dwelling beyond the Horizon.
According to the Oracles, the Zigg'raugglur exists fourth dimensionally, and dwell beyond the Horizon, which is the only thing preventing them from regular contact with the Earth. It has a vast understanding of time and space, and perceives time in an almost Euclidean geometry as humans or mages perceive space. Since the creature does not exist in a three dimensional reality only portions of it may be perceived, giving it the appearance of segmentation. To perceive it in full, Correspondence and Time effects are presumably required.
The Zigg'raugglur hunts and feeds on Quintessence throughout Earth's space/time continuum, stealing the Quintessence from times in the past before the Gauntlet and the Horizon blocked its access. It gathers what Quintessence it can before it is chased away by Paradox spirits. These powerful Paradox spirits hunt for past anomalies to the present in order to prevent the Zigg'raugglur from wreaking havoc in Earth's past.
The Zigg'raugglur is allied in some manner to the Nephandi, possibly in a bargain to allow the Zigg'raugglur to pass through the Horizon, but the details of this alliance are unclear.
Besides knowledge of and the ability to preceive and move through time and space, the The Zigg'raugglur are also able to harvest Quintessence. What other abilities they may have is unknown.