Khthonic Gate

The Khthonic Gate is the Pluto-side twin of the Elysian Gate, another Dark Age warp-door that dumps traffic inside Sol without a conventional translation. Sigismund's First Sphere fought here twice: Alpharius's strike on Pluto, then Horus Aximand's Sons of Horus when the Warmaster's armada arrived. When the gate fell, the road to Terra was open.