Cid, The Echo Of A Lost Song

Spellcasting (Bardic Corruption).
Cid is a 12th-level spellcaster. His spellcasting ability is Charisma (spell save DC 18, +10 to hit with spell attacks).
He knows the following spells:

• Cantrips (at will): vicious mockery, thaumaturgy, mage hand, blade ward

• 1st level (4 slots): dissonant whispers, charm person, shield, healing word

• 2nd level (3 slots): suggestion, mirror image, shatter

• 3rd level (3 slots): hypnotic pattern, counterspell, dispel magic

• 4th level (3 slots): greater invisibility, phantasmal killer

• 5th level (2 slots): synaptic static, dominate person

• 6th level (1 slot): eyebite

Corrupted Song of Eternity (Recharge 5–6).
As an action, Cid unleashes a wave of dissonant music siphoned from his dying god-source. Each creature of his choice within 30 ft. must make a DC 18 Wisdom saving throw or take 33 (6d10) psychic damage and be stunned until the end of their next turn.

Siphoned Divinity (3/day).
When Cid would be reduced to 0 HP, he can instead absorb divine essence, healing 40 HP and unleashing a shockwave of necrotic energy (15 ft. radius, DC 18 Con save, 4d10 necrotic damage on a failed save, half on success).

Cunning Manipulator.
Cid has advantage on Persuasion and Deception checks made against creatures that can understand him. Once per short rest, he can magically compel a creature as if casting charm monster (DC 18).

Multiattack.
Cid makes two attacks with his Blade of the Last Chord or casts one spell and makes one attack.

Blade of the Last Chord. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage + 10 (3d6) psychic damage.

Unraveling Melody (Recharge 6).
Cid strums an arcane chord that disrupts magic. Each creature of his choice within 20 ft. must make a DC 18 Int save or suffer magical destabilization: disadvantage on concentration checks and saving throws against spells until the end of Cid’s next turn.

Legendary Actions (2/round)

• Dissonant Chord (Costs 1). Cid targets one creature within 30 ft. That creature must succeed on a DC 18 Wis save or be frightened until the start of its next turn.

• Echo Step (Costs 1). Cid teleports up to 20 ft. to an unoccupied space he can see.

• Dirge of the Forgotten (Costs 2). Cid sings a fragment of his corrupted song; each enemy within 10 ft. takes 7 (2d6) necrotic damage.