Xen’Ylthus, Troubadour of the Hells

All spells are Cha based,   Save DC 23, +15 spell attack, +6 mod

Xen’Ylthus is an 18th lvl caster, bard class- ALL spell dmg is Fire which makes immune into resistance and bypasses resistance 

Cantrips (at will): Mage hand, minor illusion, sapping sting, vicious mockery 
1st level (# 7 slots): charm person, command, hunters mark, identify , Tasha’s hideous laughter, silvery barbs, silent image

2nd lvl 6 slots: detect thoughts, invisibility, misty step, spray of cards, blindness/deafness, cloud of daggers, heat metal, silence, 

3rd lvl 6 slots: clairvoyance, counter spell, dispel magic, hypnotic pattern, fireball, lightning bolt, slow, stinking cloud 

4th lvl 5 slots: dimension door, greater invisibility, immovable object, psychic lance, compulsion, confusion,, polymorph

5th lvl 4 slots: modify memory,  animate objects, synaptic static 

6th lvl 3 slots: chain lightning, mass suggestion, Otto’s irresistible dance, 

7th lvl 2 slots: fire storm, prismatic spray, teleport, forcecage, mordenkainen’s sword, reverse gravity

8th lvl 2 slots:  dark star, feeble mind, glibness

9th lvl 2 slots:  meteor storm, power word kill, psychic scream, prismatic wall

3 melee attacks per round  plus anyone w/in 10 feet takes 1d8 fire dmg and bursts into flame taking 1d8 fire until flames are doused 

Rapier of the Planes: Melee Weapon Attack: +15 to hit, reach 15’ ft., 1 target. Hit: # 3d8 + 15) piercing damage plus 2d6 fire

Claw attack:  +13 10’ 1 target.  Hit 2d6 slashing dmg plus 2d6 fire

Bite attack:  +13 10’ 1 target.   Hit 3d8 piercing dmg plus 3d6 fire

As a bonus action, you can assume a majestic presence for 1 minute or until you are incapacitated. For the duration, whenever any creature tries to attack you for the first time on a turn, the attacker must make a CHA saving throw (DC 23). On fail, it can’t attack you on this turn, and it must choose an ally  for its attack.. On success, it can attack you on this turn, but it has disadvantage on any saving throw it makes against your spells Until your next turn 

Spelldriver ability 

Spell attack (War Caster)

Melee attack (Sentinel)

Lullaby - Attempt to interrupt spell casting by causing soft music to join the caster’s verbal component- DC 23 Cha save 

4 Legendary Resistance per day

May not repeat a legendary action in any 1 turn  3 legendary actions per turn 

Summon Succubus/Incubus:  1d4 appear and follow orders (One action)

Roiling flames: 15’ radius from self, 3d8 fire dmg, half if save DC 19 Dex (one action)

Flamewalk:  may move from current position up to 90’ to any source of flame instantly (one action)

Backdraft: flames flash in a 25’ radius from Xen’Ylthus, consuming all oxygen in the area.  Anyone who needs to breathe in the area is stunned until the end of their next turn.  Also take 4d8 fire dmg, Cha save DC 23 (2 actions)