Your fanged maw is a natural weapon, which you can use to bite as a reaction . If you hit with it, you deal piercing damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.

Starting at 6th level you have learned how to use your bite and feed. In battle, you can throw yourself into a vicious feeding frenzy. As a bonus action after successfully biting a creature and maintaining the grapple on the creature, you can make a special attack with your bite as your reaction. If the attack hits, it deals its normal damage, and you gain temporary hit points (minimum of 1) equal to the damage dealt. You can continue to feed as long as you use your action to maintain the grapple, and you can only do this to one creature at a time. After using this feature you can't use it again until the next day.

Your Strength, Dexterity and Constitution increase by 1. 

You can live for a very long time but your not immortal. You start out being as old as when you were first bit by the Vampire Lord and afterwards you age very slowly at about 1/8 of the normal rate of your base race. 

As a spawn of a Vampire Lord you feel the pull to be evil all the time but as you were saved by divine favor or by alchemical means you are not automatically evil but rather free to choose but you do tend to do evil acts.  

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.

Starting at 3rd level, you can also cast charm person with this trait. Once you cast it, you can’t do so again until you finish a long rest. Charisma is your spellcasting ability for these spells.

You resist weapon damage.

You take double damage from radiant attacks. You have disadvantage to ability checks while in direct sunlight. You can't enter into any residence unless invited in by one of its occupants. You will not willingly enter running water (i.e. crossing a river) as your vampiric nature is afraid of running water.

You can speak, read, and write Common, Abyssal, and Infernal.