Avatar of Sorrow

Legendary Resistance (4/Day, or 5/Day in Lair). If the Avatar of Sorrow fails a saving throw, it can choose to succeed instead.

Altar of Anguish. If destroyed, the Avatar of Sorrow reforms in 1d10 days if it has an Altar of Anguish , reviving with all its Hit Points. The new body appears in an unoccupied space within the Avatar of Sorrow's lair.

Resistance is Hopeless. The Avatar of Sorrows can take 2 reactions per round.

Spellcasting. The Avatar of Sorrow casts one of the following spells, using Wisdom as the spellcasting ability (spell save DC 20, spell attack bonus +12):
At will;  Contagion, Warding Bond, Insect Plague, sleep, Veil of dusk, Darkness, Moonbeam, Nondetection,
2/day each; Bestow Curse (level 5 version), Cure wounds (Level 4 version), Inflict wounds (level 4 version), Globe of Twilight, Mass cure wounds.
1/day each; Divination, Stellar Bodies, Harm

Sapping ray. Ranged attack roll: +12 to hit, range 120ft., 1 target. Hit: 24 (4d8 + 5) Necrotic damage and the Avatar of Sorrow Regains hit points equal to half the damage dealt

Touch of Despair. Melee attack roll: +12 to hit, range 5ft. On hit; 28 (8d6) Psychic Damage and a Wisdom Saving throw DC 20. Fail; The creature has disadvantage on all D20 tests until the end of it's next turn.

Voice of Sorrow(Recharge 5-6). Each creature of the Avatar of Sorrow's choice within 60ft of them must make a Constitution saving throw DC 18. Fail; 35(10d6) psychic damage and Paralyzed until the end of their next turn. Success or Failure; The target suffers a 1d4 penalty to all attack rolls and saving throws for 1 minute. They may repeat the saving throw at the end of each of their turns after 1 minute they automatically succeed 

Grief touch. The avatar of sorrow can choose one ally within 60ft. That creature gains 21(4d8+5) Hit points and can use it's reaction to be the origin for one touch spell cast by the avatar of sorrow, or the Touch of Despair until the end of the avatar of sorrow's next turn.

Healing Ray. (1/day) The Avatar of sorrow targets one creature within 5ft of it (Not including itself), that creature is regains all lost hit points.

Protective magic. The Avatar of Sorrow casts Counterspell or Shield  in response to the spell's trigger using the same spellcasting ability as Spellcasting. This Reaction can only be used once per round.

Unholy Rebuke. One creature that misses The avatar of sorrow, Wisdom Saving throw DC 20. Fail; 21(6d6) psychic damage and they have disadvantage on their next D20 test. Success; Half Damage only. This Reaction can only be used once per round.

Legendary Action Uses: 3 (4 in Lair). Immediately after another creature's turn, The Avatar of Sorrow can expend a use to take one of the following actions. The Avatar of Sorrow regains all expended uses at the start of each of its turns.

Touch of Despair. Melee attack roll: +12 to hit, range 5ft. On hit; 28 (8d6) Psychic Damage and a Wisdom Saving throw DC 20. Fail; The creature has disadvantage on all D20 tests until the end of it's next turn. The Avatar of Sorrow Can only take this Legendary Action once a round

Shadowed Teleport. The Avatar of sorrow teleports up to 60 feet to an unoccupied space it can see, and in a 10ft radius sphere magical darkness is created. Each creature within the darkness takes 11 (2d10) Psychic damage.

Emotional Damage. The Avatar of Sorrow casts Phantasmal force, not requiring concentration, using the same ability as spellcasting. The Avatar of Sorrow Can only take this Legendary Action once a round