Arcane Ballista

Limited Sentience. The arcane ballista is endowed with just enough sentience to see a target and attack it. As a result, it is immune to being frightened, stunned and charmed.

Limited Mobility. The arcane ballista can take either an action or a reaction each round, with bonus actions working normally. It also automatically fails any DEX skill checks or saving throws.

Concentrated Fire. Ranged Weapon Attack: +7 to hit, range 40/600 ft, 1 target. Hit: 21 (6d6) force damage

Arcane Cone. A ballista may choose to target multiple targets with their attack by unleashing a blast of arcane energy. First, roll a d6 to determine the type of damage.

• 1 - Fire
• 2 - Cold
• 3 - Lightning
• 4 - Necrotic
• 5 - Force
• 6 - Acid

All creatures within a 30 foot cone of the ballista must make a DC 15 DEX saving throw or take 4d8 of the damage type specified by the d6 roll. On a successful save, the creature takes half damage.

Rotation. The arcane ballista may rotate 90 degrees along any access as a bonus action. 

Concentrated Fire. Ranged Weapon Attack: +7 to hit, range 40/80 ft, 1 target. Hit: 21 (6d6) force damage

Arcane Cone. A ballista may choose to target multiple targets with their attack by unleashing a blast of arcane energy. First, roll a d6 to determine the type of damage.

• 1 - Fire
• 2 - Cold
• 3 - Lightning
• 4 - Necrotic
• 5 - Force
• 6 - Acid

All creatures within a 30 foot cone of the ballista must make a DC 15 DEX saving throw or take 4d8 of the damage type specified by the d6 roll. On a successful save, the creature takes half damage.