Void Cast Iron at Honkai Star Rail
Void Cast Iron – epic upgrade material. It has several sources of obtaining: Base Zone: Stagnant Shadow and Universal Synthesis Machine: Material Exchange.
More: Horseshoe of the Void Ranger: Suppressor. Can be used to raise Quantum Characters.
In-game description: A rare horseshoe obtained after defeating the Antimatter Legion's Suppressor. When no one is watching, she appears and disappears.
"Name of the experiment? It's just a 'Suppressor's Horseshoe'…"