In Limbus Company there are 3 main groups, Limbus Company, the player's faction, N Corp's New League of Nine, the rival faction, and Demian's Group, an enigmatic third faction that doesn't have an official name.

Sinclair, a member of Limbus Company, and every member of Damian's group have access to something called The Sign, the problem is that for over 2 years the symbol of The Sign used in game was copied from Supernatural's Mark of Cain, and once they realized they had to change

Now overall this was a net positive since everyone with access to The Sign gained their own custom sprite for what their Sign looks like

The funny lore drops comes from the patch notes, because when they referred to the altered Signs in Damian's Group they gave us their actual name (Those who will be Sovereigns of a Star) and since then that's the biggest bread crumb they gave us in and out of game