A Plasma Culverin is a type of heavy Plasma Weapon deployed by the Adeptus Mechanicus' Kataphron Battle Servitors, particularly the variant known as the Kataphron Destroyer. Plasma Culverins sacrifice the range of their cannon pattern equivalents in exchange for a higher rate of fire.
Only the Adeptus Mechanicus dare coax such rampant destruction from their Plasma Weapons, yet to the Adepts of the Forge World of Ryza in particular, the scars they leave on wielder and war zone alike are considered quite normal.
- Codex Adeptus Mechanicus - Cult Mechanicus (7th Edition) (Digital Edition), pp. 234, 237