
This artifact is currently in Karn's possession. So, it seems that this isn't the same artifact that Urza used on Argoth, but it has a similar power. He described it as a creation of Urza to fight against the phyrexians and planned to use it to destroy New Phyrexia.

In Dominaria's folklore, Karn found the Cylex (with a "C", instead of an "S"). The explosion of the Sylex destroyed both armies and the island of Argoth, changed the climate of Dominaria, initiating the Ice Age, and caused the fall of most civilizations in the plane. When he realized that his brother Mishra had become a phyrexian, Urza activated the artifact. Call the end, fill with memories of the land."ĭuring the final battle of the Brothers' War between Urza and Mishra in Argoth, Ashnod delivered the Sylex to Tawnos, Urza's Apprentice, who in turn gave it to Urza. Topple the empires to bring a fresh start. Without more information, Feldon was incapable of determining if Golgothia was a place or the person responsible of creating the item. These glyphs named the item as "Sylex" and its origin as "Golgothia".

The strange chalice was made with a metal that looked like copper, with around 30 cm of diameter, its interior sculpted with glyphs of many ancient languages. During the time of 'Antiquities', the Golgothian Sylex was accidentally found by fishermen and sent to Feldon of the Third Path for study purposes.
