Your claws are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d4 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.

Being a native of the lower planes, you are a fiend (yugoloth) as well as a humanoid.

Your Intelligence score increases by 2 and your Charisma score increases by 1.

As your true form is tied to the Blood Rift, you cannot die completely. Unless you are killed while in your home-plane, you are immortal.

Arcanaloths are Yugoloths, the neutral fiends of the lower planes, particularly the bridge between the battling forces of the demons and devils. As such, they are all neutral evil, though they can be persuaded otherwise. 

Arcanaloths range from under 5 to over 6 feet tall. They have the head, tail and claws of a jackal or fox with thick fur covering them. Your size is Medium.

Your base walking speed is 30 feet.

You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

When you are attacked with a spell attack or must make a saving throw against a spell or other magical effect, you may spend your reaction to impose disadvantage on the attacker or gain advantage on that saving throw. Once you use this feature, you can't use it again until you cast a spell or spend your action to recharge it.

You know one cantrip of your choice from the wizard spell list. Intelligence is your spellcasting ability for this spell.

You can speak, read, and write Common, Abyssal and Infernal, as well as one other language of your choice. Being neither part of the hierarchy of the devils or the chaos of the demons, Arcanaloths are impartial to their dealings. You also are well read and learned, and as such know more about language than others would.