Sith Cat

Small Fey, LE
AC: 15, HP: 195
Speed: 30', Climb: 40'

Str: 14 (+2), Dex: 20 (+5), Con: 16 (+3), Int: 16 (+3), Wis: 17 (+3), Char: 21 (+5)
ST: Dex: +10
Skills: Deception: +10, Perception: +8, Stealth: +15
Dmg Resistance: Bludgeoning, piercing & piercing from nonmagical weapons that aren't made of cold iron
Conditions Immunities: Charmed, Frightened
Senses: Truesight: 120', PP: 18
Languages: Common, Sylvan
Challenge: 13 (10,000 XP)
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Innate Spellcasting: The cat's innate spellcasting ability is Char (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 Wis ST, on a failure the creature has disadvantage on attack rolls, ability checks and ST for 1 hr. The target can repeat the ST at the end of each of its turns, ending the effect on itself on a success.
Magic Resistance: The cat has advantage on ST against spells & other maigcal effects.
Shadow Step: As a bonus actionwhile in dim light or darkness, the cat can teleport up to 60' 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.
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ACTIONS

Multiattack: The cat casts a spell if it can. It then makes two attacks.
Claws: Melee Weapon Attack; reach 5' one target, +10 to hit. On a hit target takes 3d4+5 slashing dmg.
Cold Cats: The Cat Sith or Cat Sidhe is a powerful fey resembling a black cat with a white spot on it's chest. It is a stealthy pretector 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 non can confirm this for obvious reasons.
Soul Theif: 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.