Ghostly Cannon Barrage is a mage ability in Dungeon Quest that increases in damage with spell power. When activated, the user will call down a barrage of ghostly cannonballs from the sky, dealing twelve ticks of AoE damage to enemies. Ghostly Cannon Barrage has a total spell multiplier of 27.6x (2.3x per tick). Ghostly Cannon Barrage can be obtained from Pirate Island on Insane difficulty. It can be sold for 25,000 gold and requires players to be at least level 60 to equip it.
Ghostly Cannon Barrage has poor vertical range, meaning that anything too far above or below Ghostly Cannon Barrage's cast position may avoid damage.