Medium humanoid (human), lawful neutral

Armor Class: 17 (Metal Armor)

Hit Points: 204 24d8+96

Speed: 30 ft

STR

10 +0

DEX

22 +6

CON

16 +3

INT

20 +5

WIS

22 +6

CHA

20 +5

Saving Throws: Dex +10, Int +8, Cha +9

Skills: Deception +8, Insight +7, Perception +20, Stealth +9

Damage Resistances: Cold, fire, psychic, bludgeoning, piercing, and slashing from nonmagical attacks, and magic

Condition Immunities: paralyzed, restrained, and incapacitated

Senses: Passive Perception 17

Languages: Common, Draconic, Infernal, Undercommon, Underdraconic

Challenge Rating: 15 ( 13,000 XP)

Proficiency Bonus: +5

Actions

Multiattack. The srgt makes 2 attacks per turn, causing the gun to fire 4 times.   Two for flinching 1st shot. Ranged Weapon Attack: +11 to hit, all targets in a 60-foot-cone. Hit: 15 2d8+6 radiant damage. Target can't use healing feats for 3 turns.
Two for flinching 2nd shot. Ranged Weapon Attack: +11 to hit, all targets in a 60-foot-cone. Hit: 15 2d8+6 necrotic damage. When dealing 22 dam, the target's current hp becomes max hp for 1 min.

Legendary Actions

The srgt makes 3 legendary actions per round. Legendary actions are taken at the end of someone else's turn. The srgt regains spent legendary actions at the start of its turn.   Move. The srgt moves up to 30 ft.
Speed Load. The srgt reloads his gun.
Command. The srgt summons 1d4 guards to help him.