Immutable Form. The Walking Cannon is immune to any effect that would alter its form.
Commanded by Its Owner. The Walking Cannon must be within 150 feet of its owner to receive commands. It cannot take actions if it is more than 150 feet away from its owner. The owner makes a bonus action to command the cannon and the cannon takes its action immediately after. It does not roll initiative or act on its own.
Ballista Fire. The Walking Cannon can fire a powerful ballista as an action when commanded by its owner. Choose a point within 300 feet. Each creature in a 20-foot radius sphere centered on that point must make a DC 15 Dexterity saving throw, taking 21 (6d8) force damage on a failed save, or half as much damage on a successful one.
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