When you remplace your race with this lineage, you keep any speed (climbing, swimming, flying) and any skill proficiency. Either, you can choose two skill, and you gain their proficiency.

Your teeth grew longer and sharper. You can make a Bite attack, concidered as a simple weapon you are proficient with. You add your Constitution Modifier to the attcks and damage of this bite, you deal 1d4 + Contitution Modifier Piercing damage on a hit. You have advantage on attacks with this Bite when your are Bloodied.

When you hit a creature that isn't an Undead or a Construct, you can fortify yourself in one of those two ways: 

• You heal all the damage dealt by the Bite
• You have a bonus to your next d20 Test equal to the damage dealt by the Bite

You can fortify yourself up to your Proficiency Bonus times per Long Rest.

You have Climbing Speed equal to your Walking Speed. When you reach level 3, you can walk on vertical surface and ceilings without using your hands.

You have Darkvision in 60 feet.