Cat Sìth

Innate Spellcasting. The cat's innate spellcasting ability is Charisma (spell save DC 18). It can innately cast the following spells, requiring no material components:

At will: darkness, hex, minor illusion

3/day: bestow curse, invisibility, magic circle

1/day: greater invisibility, imprisonment

Lucklessness. Once per turn, the cat can force a creature it hits with a weapon attack to make a Wisdom saving throw, on a failure the creature has disadvantage on attack rolls, ability checks and saving throws for 1 hour. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Magic Resistance. The cat has advantage on saving throws against spells and other magical effects.

Cold Cats. The Cat Sith or Cat Sidhe is a powerful fey resembling a black cat with a white spot on its chest. It is a stealthy protector of portals to and from the Feywild and their surrounding forests.
Cat Sith are loyal to the unseelie courts, and are thus connected to cold, dark and death. Cat Sith can steal away the luck of mortals and travel through shadows. Rumour has it that the most powerful Cat Sith in existance is the winter queen's assassin, though none can confirm this for obvious reasons.

Soul Thief. Legend has it that when a Cat Sith comes into contact with the body of someone that has recently died the Cat Sith steals the soul away.

Multiattack. The cat casts a spell if it can. It then makes two attacks.

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 12 (3d4+ 5) slashing damage.

Shadow Step. As a bonus action while in dim light or darkness, the cat can teleport up to 60 feet to an unoccupied space it can see that is also in dim light or darkness. It then has advantage on the first melee attack it makes before the end of the turn.