Excal-heim
Spellcasting ability: Int
Spell attack: +6
Spell save: 14
At Will Detect thoughts
3/day Blight Flame Bomb, counterspell
2/day Plane shift(self only), Blight Flame Spire
Living Shadow. While in dim light or darkness, other creatures without true sight have disadvantage to perceive the dragon.
1/10 chance to drop the Tome of the Void
Multiattack. The dragon makes three attacks: one with its bite and two with its claws. Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 15 2d10+4 piercing + 5 2d4 fire + 5 2d4 necrotic damage. Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 14 3d6+4 slashing damage. Blight Flame Breath (Recharge 5-6). The dragon exhales black fire in a 30-foot cone. Each creature in that area must make a DC 18 Dexterity saving throw, taking 33 6d10 fire + 33 6d10 necrotic damage on a failed save, or half as much damage on a successful one. Additionally, on a fail, their hit point maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the target finishes a long rest.