Huge monstrosity, lawful neutral

Armor Class: 16 (natural armor)

Hit Points: 200 20d10+90

Speed: 35 ft

STR

18 +4

DEX

18 +4

CON

19 +4

INT

12 +1

WIS

20 +5

CHA

16 +3

Saving Throws: Str +11, Con +10, Wis +11

Skills: Perception +11

Damage Vulnerabilities: Silvered weapons

Condition Immunities: charmed, frightened

Senses: Darkvision 60ft., passive perception 21

Languages: Common, Celestial

Challenge Rating: 13 (10,000xp)

Actions

Multiattack. Ludwig makes 3 attacks with his Holy Moonlight Sword.   Holy Moonlight Sword. Melee Weapon Attack: +11 to hit, reach 10ft, one target. Hit: 14 2d8+5 slashing + 9 2d8 force damage.
Holy Moonlight Sword (Beam). Ranged Weapon Attack: +11 to hit, range 60ft, one target. Hit: 32 6d8+5 force damage.
Moonlight Blast (Recharge 5-6). Ludwig rams the Holy Moonlight Sword into the ground and unleashes a blast of arcane power on a 20-foot-radius, 40-foot-high cylinder centered on himself.
Each creature except for Ludwig must make a DC 19 Dexterity saving throw, taking 55 10d10 force damage on a failed save and half as much on a successful one.