Starsteel

Starsteel is a type of steel made from meteoric ore, where the meteorites that bring this metal are actually fragmented pieces of Mount Celestia as well as some fragmented pieces of the dead gods that range from some gods that have died in the Cosmic invasion to ancient gods whose body floated in the Astral Sea for eons, before being sundered into millions of smaller pieces that travelled in all directions at incredible speeds, with many of which managed to wander through portals to other planes of existence. For some reason Fey creatures have an inherent weakness to Starsteel, which burns them with its extreme cold that only they can feel. Starsigners as well as Dreadlords are also vulnreable to weapons made of Starsteel perhaps this is due to the holy elements reacting with the divinity fragments that Starsigners possess and the Ichor fragments that the Dreadlords possess.

''Player's Note: Weapons made of Starsteel give advantage on attack rolls made against Fey, Starsigners, and Dreadlords. It also ignores any damage resistances they may have, while armors/shields made of the metal give fey, Starsigners, and Dreadlords disadvantage on attack rolls made against them.''