Four Viscous Cannon variations with unique visual and audio effects were produced: spectral; balefire; magma; and witchfire. These were respectively named:
Devil's Viscous Cannon
Winter Viscous Cannon
Molten Viscous Cannon
Occult Viscous Cannon
The Viscous Cannon is referred to as "Weapon_BombLauncher_Sticky" in the Nosgoth game data.