Aberrant Familiar

The Familiar has a total number of d4 Hit Dice equal to your Warlock level. It also gains all the normal benefits of both short and long rests.

When the Familiar is forced to make an ability check or saving throw, it adds your PB to its roll.

The Familiar has advantage on saving throws against spells and magical effects.

One creature the Familiar can see within 30 ft. must succeed on an Intelligence saving throw or take 1d4 +PB psychic damage and subtract 1d4 from the first d20 roll it makes before the start of the Familiar's next turn.