C.F. Nine-Tailed Fox

Keen Hearing and Smell. The Nine-tails has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Superior Invisibility. The pixie magically turns invisible until its concentration ends (as if concentrating on a spell). Any equipment the pixie wears or carries is invisible with it.

Innate Spellcasting. The pixie’s innate spellcasting ability is Charisma (spell save DC 12). It can innately cast the following spells, without requiring components:

At will: [Tooltip Not Found]

1/short rest: minor illusion

Arcane Transference. The familiar can consume one of your pact magic slot of the appropriate level to cast the following spells:

2nd level: phantasmal force

5th level: synaptic static

Beguile. Fox spirits are hard to tame. It attempts to compel a creature into a game of riddles with an offer. One creature that it can see within range must make a Wisdom saving throw. On a failed save, the creature is drawn to it, compelled by its divine demand and the creature must then agree to some terms with the fox. The winner of the contest asks a previously agreed upon boon of the other. For the duration, it cannot attack the nine-tails, and must make a intelligence saving throw each turn. (or the DM can use a game of riddles) The game ends when a creature fails an Intelligence Save. The compelled creature's riddle DC equal to Intelligence + Proficiency, the fox's DC is 17

When you summon this familiar it will attempt to beguile you with the offer being its servitude. If you fail it disappears, but will collect its agreed upon reward sooner or later. If the familiar's hit points drop to 0 and it disappears then it will attempt to beguile you again on summoning it.