Crocotta

Oracular Visions. The Crocotta can see several vital seconds into the future. This creature has permanent advantage on all saving throws, and all Attacks of Opportunity when the creature uses the Bonus Action: Disengage are made at disadvantage. This is only affected if one damages the creature's eyes. 

Unwilful Ignorance. This creature permanently has the effects of the spell Pass without Trace on itself, making it nigh-impossible to be noticed if it choses to hide, even despite it's size. Should it not move whatsoever, it is nigh impossible to see, all perception checks to attempt to find it are made at Disadvantage with an additional -5 to the roll.

Spellcasting. The Crocotta is a 3rd-level spellcaster. Its spellcasting ability is Charisma (spell save DC 17, +3 to hit with spell attacks). The Crocotta has the following Evocation and Enchantment spells prepared:
Cantrips (at will): Eldritch Blast, Vicious Mockery
1st level (5 slots): Thunderwave, Hideous Laughter
2nd level (3 slots): Hold Person, Suggestion, Tasha's Mind Whip
3rd Level (1 slot): Pulse Wave

Claw Attack. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 13 (1d10 + 3) Slashing damage. 

Bite Attack. Melee Weapon Attack: +2 to hit, reach 5 ft., 1 target. Hit: 11 (1d10 + 1) Piercing damage.

Spell Attack. Ranged Weapon Attack: +3 to hit with DC 17.

Attacks of Opportunity when the Crocotta uses the Bonus Action Disengage are made at disadvantage due to the Oracular Visions trait. All spells can also be cast at half-damage as a Bonus Action. 

Grapple. You can choose to grapple and restrain a creature in your mouth. a DC16 Strength check at the result of their turn is required for the creature to pry themselves free from the Crocotta's maw. While a creature is grappled, the -5 from the Unwilful Ignorance trait is forfeited. 

This creature is incredibly rare, speculated to be born of the blood of Yeenoghu. Having powerful minds and insurmountable determinism to achieve their own ends, they may call upon mythic magic from the deepest, darkest places of the abyss, sources that of which are beyond all understanding and reason.

Create Servants (Costs 2 Actions). mustering the magic within them to a point of almost harming themselves, the Crocotta will pick up to three creatures within a 45 ft. circular range. Said creatures will have to make a general DC 19 Saving Throw, or be horrifically and permanently transfigured into Gnolls, and brainwashed into servitude to the Crocotta. Greater Restoration and Wish can undo the brainwashing, however the status of becoming a Gnoll does not change, and will require either another Wish, or True Polymorph to revert properly.