Eldritch Cannon

When two Warlocks in a party have the same initiative and within 5 feet of each other. They can join hands and extend the opposite arm out to combine Eldritch Blasts. A huge beam of crackling energy streaks toward a creature within range.

Make a ranged spell attack against the target. On a hit, the target takes 3d10 force damage. As spell creates more than one beam when you reach higher levels, the combined blast is more powerful: 6d10 at 5th level, 9d10 at 11th level, and 12d10 at 17th level. You can only direct beams at the same target. If you have one high and low-level warlock, the amount of beams is the nearest level between the two casters.