Huge Adult Black Dracolich, Any Evil
Symvernus is an 11th level spellcaster. His spellcasting ability is wisdom (spell save DC 20 + 10 to hit with spell attacks). And has the following spells prepared. Cantrips (At will): Thaumaturgy, Mending, Edritch blast, Control flames 1st Level (4 slots): Charm person, Create or destroy water, Sleep 2nd Level (3 slots): Calm emotions, Knock, Hold person 3rd Level (3 slots): Feign death, Revivify, Meld into stone 4th Level (3 slots): Greater invisability, Locate creature, Phantasmal killer 5th Level (2 slots): Dream, Tree stride 6th Level (1 slots): Druid grove
Magic Resistance. Symvernus has advantage on saving throws against spells and other magical effects Dragonic Polymorph. At will Symvernus may turn into his human form (old fur-coated human with large ornimented staff) and vise versa back into his draconic form (While in human form, Symvernus may cast spells but gains none of his Special abilities).
Multiattack. Symvernus can use his Frightful Presence. He then makes three attacks: one with its bite and two with its claws. Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage plus 5 (1d10) acid damage. Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) slashing damage. Tail. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage. Frightful Presence. Each creature of Symvernus's choice that is within 120 feet of Symvernus and aware of him must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. 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 Symvernus's Frightful Presence for the next 24 hours. Acid Breath (Recharge 5–6). Symvernus exhales acid in a 90-foot line that is 5 feet wide. Each creature in that line must make a DC 20 Dexterity saving throw, taking 66 (12d10) acid damage on a failed save, or half as much damage on a successful one.
Symvernus can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Symvernus regains spent legendary actions at the start of its turn. Detect. Symvernus makes a Wisdom (Perception) check. Tail Attack. Symvernus makes a tail attack. Wing Attack (Costs 2 Actions). Symvernus beats its tattered wings. Each creature within 10 ft. of Symvernus must succeed on a DC 21 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. After beating its wings this way, Symvernus can fly up to half its flying speed.