Shapechanger. The familiar can use its action to polymorph into a beast form that resembles a rat (speed 20 ft.), a raven (20 ft., fly 60 ft.), or a spider (20 ft., climb 20 ft.), or back into its true form. Its statistics are the same in each form, except for the speed changes noted. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.
Devil's Sight. Magical darkness doesn't impede the famaliar's darkvision.
Magic Resistance. The familiar has advantage on saving throws against spells and other magical effects.
Sting (Bite in Beast Form). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 10 (3d6) poison damage on a failed save, or half as much damage on a successful one.
Invisibility. The familiar magically turns invisible until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the familiar wears or carries is invisible with it.
Description
The Great Old One Familiar is a tiny aberration that doesn't belong in this dimension. It was given to (or forced upon) a warlock by their Great Old One through a Pact of the Chain. Each familiar resembles its creator, meaning that regardless of its natural appearance it's horrifying, unnatural, and beyond normal description.
In most situations, it uses its Invisibility to avoid exposing itself to a world that could never understand. It's Shapechanger ability allows it to blend into the world by impersonating local creatures when necessary.
Note: For gameplay purposes this is an Imp. The purpose of this creature is to offer an RP-appropriate familiar for Warlocks with the Great Old One patron that has the same benefits and powers as the Imp. You could think of it as a tiny Cthulhu, a little floating Yog-Sothoth, or a diminutive avatar of whatever other patrons you come up with.
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