In the 41st Millennium, the Adeptus Mechanicus sanctioned model of the Volcano Cannon is the MkIV Phaeton pattern, which was perfected by mid-M35, and is denoted by the astonishing white light of the laser. In contrast, the MkIII Synne pattern Volcano Cannon produces an orange-yellow laser akin to the solar flare of a dying star. The original Mk I variant generated a powerful red beam, truly like a river of lava in the night, though it proved almost as volatile as the unsuccessful MkII Teracharge Volcano Cannon. This was said to be even more powerful than the current MkIV, but was never used in service as it almost invariably destroyed the arms of the Titans and hulls of the tanks that carried it. Once the current stable model had been created, it began to be manufactured in small numbers