Warped Orienna

Darkvision. Warped Orienna has darkvision up to 60 ft.

Aberrant Resistance. Orienna has resistance to cold damage.

Spellcasting. Warped Orienna is a 5-level spellcaster. Her spellcasting ability is Charisma (spell save DC 15, +7 to hit with spell attacks). Warped Orienna has following Illrigger spells prepared:
Cantrips (at will): Fire Bolt, substituting cold damage in the place of fire.
1st level (3 slots): Hell's Lash
2nd level (2 slots): Armor of Agathys
3rd level: Mote of Hell 

Multiattack. Warped Orienna makes two Brimstone Staff attacks.

Brimstone Staff. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 8 (1d8 + 4) bludgeoning damage. 

Fire Bolt: Orienna may cast Fire Bolt.

Hell’s Lash (3/Day): 1st-level evocation. Range: 30 feet. Components: V, S, M (the forked tongue of a serpent). Duration: Concentration, up to 1 minute. Orienna produces a whip of red fiery energy that lashes out at a creature within range, creating a conduit between you and the target. Make a ranged spell attack against that creature. On a hit, the target takes 1d10 cold damage, and on each of your turns for the duration you can use your action to deal 1d10 cold damage to the target automatically. The spell ends if you use your action to do anything else. The spell also ends if the target is ever outside the spell’s range or if it has total cover from you.

Armor of Deception (1/Day): Orienna weaves a web of frightening illusions that last for 1 minute around another creature the deceiver can see. Creatures who take the attack action against her while the illusions last must make a DC 15 Wisdom saving throw or be frightened until the end of their next turn. Creatures who make the save are immune to this effect for 24 hours.

Armor of Agathys (2/Day): Orienna may cast Armor of Agathys twice per day.

Mote of the Void (1/Day): Warped Orienna manifest a Mote of the Void on the Mundane World. A 15-foot-radius sphere of darkness, decay, and entropic cold arrives, centered on a point within range and lasting for the duration of the spell. The cloud of abyssal pain and insanity echoes with the cries of warped, tortured souls that can be heard by anyone within 30 feet of the cloud. No light, even magical light, can illuminate the area, and any creatures fully within the area are blinded. The cloud warps the timescape and the area is difficult terrain. Any creature that starts its turn in the area takes 2d6 cold damage. Any creature that ends its turn in the area must succeed on a Wisdom saving throw or take 2d6 psychic damage as the voices of the damned crowd their mind.

Warped Orienna gets two Legendary Actions.

Brimstone Staff. Orienna may use a legendary action to make a staff attack.

Fire Bolt. Orienna may use a legendary action to make a fire bolt attack, replacing cold damage for the fire damage.

Behold. Orienna may use two legendary actions to stare deeply into a party member's eyes. The party member must make a Wisdom 15 save. On a fail, they take 3d10 psychic damage. On a success, they take half damage.