Golgothian Sylex

The Golgothian Sylex, sometimes incorrectly called the Argivian Sylex, was a mysterious ancient artifact, discovered in the Ronom glacier during the Brothers' War by archeologists from Lat-Nam. Ashnod came into possession of it, and passed it through Tawnos to Urza, on Argoth, where the elder brother activated the device. The ensuing Sylex Blast destroyed both Urza and Mishra's armies, altered Dominaria's climate to begin the Ice Age, and caused the downfall of most of Dominaria's major civilizations.

Long after the Brothers' War, the planeswalker Ravidel obtained the Golgothian Sylex through a bargain after a duel with Ash Warlord Embereck in a sunken city of Terisiare after the Ice Age. In Year One by the Reckoning of the Sages of Minorad, Ravidel appeared at Minorad and threatened to use the Sylex unless the five planeswalkers present—Liana of Minorad, Ash Warlord Embereck, Kristina of the Woods, Grenfell Mor of Golthonor and Altair of Coloni – promised not to interfere with his actions on Dominaria, to which they agreed. In the year 1281 by the Reckoning of the Sages of Minorad, Ravidel threatened to use it again, so Jared Carthalion and Kristina found the long-daggers that would destroy the Sylex. Jared used the daggers to make the Sylex vulnerable to a shatter spell, wheich finally destroyed the artifact.