Altraloth (Arcanaloth Version)

Empowered Attacks. The Altraloth's attacks are treated as magical for the purpose of bypassing resistance and immunity to nonmagical weapons.

Keen senses. The wolf has advantage on Wisdom (Perception) checks that relies upon hearing, sight or smell

Soul Drain. When the weeping would start its turn, each unconscious creatures within 30 ft of the weeping wolf must succeed on a DC 15 Wisdom saving throw or die, as it's soul is devoured by the Altraloth. The Altraloth regains a number of hit points equal to 5 times the level (or challenge rating) of any creature killed this way. On a successful saving throw, a creature is immune to the Soul Drain of the Altraloth for the next 24 Powers.

Innate Spellcasting. The Altraloths spellcasting ability is Charisma (spell save DC 19). Altraloth can innately cast the following spells, requiring no material components:

At will: Alter Self, Invisibility (Self only), Darkness, Telepathy

Legendary Resistance (3/Day). If the Altraloth fails a saving throw, it can choose to succeed instead

Spellcasting. The Altraloth is a 16th-level spellcaster. Its spellcasting ability is Intelligence (Spell Save 21, +13 to hit with spell attacks

• Cantrips (at will): fire bolt, mage hand, minor illusion, prestidigitation

• 1st level (4 slots): detect magic, shield, silent image, cause fear

• 2nd level (3 slots): detect thoughts, mirror image, phantasmal force, suggestion

• 3rd level (3 slots): counterspell, fear, blink

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

• 5th level (2 slots): synaptic static, hold monster

• 6th level (1 slot): mental prison

• 7th level (1 slot): reverse gravity

• 8th level (1 slot): maddening darkness

Multiattack. The Altralothcan use it's Piercing Gaze: It then makes 2 attacks with its bite

Piercing Gaze. All the Altraloth 's eyes fix their stare upon a single foe, looking through its material body and glares upon the creature's mind and soul. The target must make a succeed on a DC 18 Wisdom saving throw or take 32 (8d6) psychic damage, and the target has disadvantage on all attacks made against the Altraloth. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. 

Bite. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 24 (3d10+ 8) Piercing damage.

The Altraloth 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. The Ultraloth regains spent legendary actions at the start of its turn.

Detect. The Altraloth makes a Wisdom perception check.

Piercing Gaze (Cost 2 actions). The Altraloth uses its Piercing Gaze as a reaction. 

Frightening Howl (Costs 3 Actions). The Altraloth lets out a shrieking howl, and all creatures within 60 ft of the Altraloth must succeed on a DC 18 Wisdom saving throw against this harrowing sound or become frightened for 1 minute. A frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to the Ultraloth's howl for the next 24 hours.