From Lexicanum

God-Splitter is a powerful Daemonhammer gifted to Gabriel Angelos of the Blood Ravens 3rd Company by Inquisitor Mordecai Toth on the planet Tartarus to combat the Daemon of the Maledictum.¹ It contains a fragment of the Wailing Doom used by the Craftworld Biel-Tan's Avatar of Khaine, recovered in the aftermath of the Avatar's battle with the Daemon centuries ago.²

Source

• ¹Dawn of War
• ²Dawn of War (Novel)