The use of Vulcan Mega Bolters on Titans dates back to before the tragic ending of the Great Crusade, and, as such, many Chaos Titan Legions also possess them within their own heretical arsenals. On their quest for destruction, they use them liberally, and to brutal effect. On the Shrine World of Gundora in the Tratoll System, corrupted Titans in possession of this weapon tore the entire 44th Cadian regiment to shreds. So relentless was the bulletstorm that some Cadian vehicles were later discovered half-buried, the pressure of the many impacts having pushed them under the sands.