This firearm is the result of the sustained efforts of one Descendant who was obsessed with explosions.
This Descendant was inspired when he witnessed a Vulgus named Sigvore of the Legion of Darkness easily controlling an explosive weapon. Although he was the enemy, the Descendant could not help but marvel at the power of bombs. The Descendant proceeded to follow Sigvore and record everything he learned about his weapon. Later, he seized the weapon for himself and submitted it to Albion to use for development purposes.
The Weapon Development Department, impressed by the Descendant's passion, reverse engineered and duplicated the weapon according to his wishes and developed a brand new launcher. They added an extra Sticky Bomb inside the launcher for additional firepower. This weapon was originally set to be named "Esiemo's Proof" after the Descendant who had made its creation possible, but Esiemo adamantly opposed this name, so it was changed to "Sigvore's Proof."