The masthead that belonged to Xim the Despot was crafted from mytag crystal and served as a symbol for Xim. This masthead was located in Dryden Vos's private collection on his luxury starship, the First Light, as of 10 BBY. Vos was a crime syndicate leader within Crimson Dawn. During a battle that took place on the yacht, the masthead was obliterated, and Vos met his end.
The masthead of Xim the Despot is an explicit homage to the Star Wars Legends book Han Solo and the Lost Legacy, which prominently displays a sizable crystal skull on its cover. Both Xim the Despot himself and Mytag crystal were first introduced in that novel.
Within the narrative of the novel, Xim the Despot reigned as a pre-Galactic Republic military leader. He established a vast galactic dominion situated within the Tion Cluster, and he utilized a skull featuring starbursts in its eye sockets as his unique emblem. At that point in time, synthetically created mytag crystals were a critical component in scanning devices and communication systems, but were later rendered obsolete due to advancements in technology.
Beyond his individual infamy, Xim was well-known because of his hidden cache of riches. In 1 BBY, Han Solo was a member of the group that discovered this cache, only to realize that it largely consisted of Mytag crystals and other materials that were extremely valuable during Xim's era, but held almost no worth by the time they were found.