Gargantuan void demon, unaligned

Armor Class: 32

Hit Points: 1,500,000hp (15,000d100)

Speed: 100 ft , fly: 200 ft , swim: 200 ft , can hover

STR

60 +25

DEX

22 +6

CON

60 +25

INT

40 +15

WIS

22 +6

CHA

23 +6

Saving Throws: Str +18, Dex +18, Int +10

Damage Vulnerabilities: fire, ballista

Damage Resistances: piercing and slashing from nonmagical weapons

Damage Immunities: ice, poison, water

Senses: darkvision 240ft, passive perception 19

Challenge Rating: 60

Actions

Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its tail.

Frightful Presence. Each creature of the void guardian's choice that is within 240 feet of the guardian and aware of it must succeed on a DC 20 Wisdom saving throw or become frightened for 2 turns. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the to the void guardian's Frightful Presence for the next 24 hours.

Bite. Melee Weapon Attack: +16 to hit, reach 120 ft., one target. Hit: 100 (10d10+9) 10d10+9 piercing damage.

Tail. Melee Weapon Attack: