Shapechanger. Xavier can use its action to polymorph into a beast form that resembles a rat (speed 20 fFat.), 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 Xavier's darkvision.
Magic Resistance. Xavier has advantage on saving throws against spells and other magical effects.
Familiar. Xavier canot attack but can perform any other actions
Familiar Telepathy. Range 100 ft. You can communicate with Xavier telepathically, Additionally, as an action, you can see through your familiar’s eyes and hear what it hears until the start of your next turn, gaining the benefits of any special senses that the
familiar has. During this time, you are deaf and blind with regard to your own senses.
Familiar Dismissal. A s an action, you can temporarily dismiss your familiar. It disappears into a pocket dimension where it awaits your summons. Alternatively, you can dismiss it forever. As an action w hile it is temporarily dismissed, you can cause it to reappear in any unoccupied space within 30 feet of you.
Familiar Spell Sharing. When you cast a spell with a range of touch, your familiar can deliver the spell as if it had cast the spell. Your familiar must be within 100 feet of you, and it must use its reaction to deliver the spell when you cast it. If the spell requires an attack roll, you use your attack modifier for the roll.