Buy RS3 Dwarf multicannon
The dwarf multicannon is a members-only ranged weapon in RuneScape 3. You do not wear it. You set it up on the ground. Once it is loaded with steel or meteorite cannonballs, it spins and fires on its own at nearby monsters. You must finish the Dwarf Cannon quest to use it.
The cannon holds up to 30 cannonballs and can fire up to 8 per full spin. It has a max hit of 1,152. A dwarf multicannon upgrade kit doubles its damage, and meteorite cannonballs raise the base damage to 150 percent. Gold and Royale upgrades raise the cannonball capacity to 60 and 90.
Players love the cannon for Slayer training. It hits many monsters at once, so tasks go much faster. It works very well with cinderbane gloves, since it can spread poison to whole groups fast. You can even melee your task while the cannon fires, so you keep most of your melee experience too.
Using the cannon gives Ranged or Defence experience, based on your settings, plus Constitution experience. If the cannon decays or breaks, Nulodion the dwarf engineer replaces it for free.