Builder Base Double Cannon Level 4 Required

This requires that the cannon is at least 7 in the village of the house, which is unlocked at the town hall 6 and a double level 4 cannon in the builder base, which is unlocked at the builder hall 4. While the double cannons give per second they. This will add a fast attack mode that increases the damage in exchange for a shorter range, similar to the archer tower from the builder base. Unlocked from level 7, you must have a double cannon level 4 on your builder base.