Since the Fuvil's claws are extremely sharp and can do much damage they are extremely strong and their stone gives them a lot of health and even more strength.

Fuvil can live for a very long time, they have a internal core called the Crystaline inside of them providing them a life force. If this core is completely destroyed, or after 1,000 years this core is shutdown and the Fuvil will begin to go out of control attacking what ever it sees until it is stopped. The Fuvil hits maturity at the age of 80.

Generally Fuvil don't go towards evil, or even good. There are exceptions for both side, but many Fuvil are neutral in the field of Alignment.

Fuvil are generally a small size.

Fuvil's walking speed is 25 because of their stone weighing them down.

Thanks to your owl like eyes, you have superior vision in dark and dim conditions. 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.

You do not need to breathe, eat or drink. Ever.

You know the minor illusion cantrip. When you reach 3rd level, you can cast the Chill Touch cantrip and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the Mage Hand cantrip and regain the ability to do so when you finish a long rest. Whenever you cast these spells you use strength or constitution to do so.