Because living beings cannot travel through the Soul Cairn, Serana will offer to turn them into a vampire. The first comes during Serana's quest to find her mother in the Soul Cairn. If the Dragonborn refuses Harkon's offer and joins the Dawnguard, there are still two other opportunities to receive the gift. Related: Skyrim: How to Access the Orc Strongholds (and Why you Should) Eventually, they gain the power to turn into an invulnerable mist that allows them to avoid taking damage while their stats regenerate. For example, they gain Blood Magic skills to summon gargoyles to their aid or use their vampiric grip to draw enemies closer to them in combat. They also have access to a unique skill tree that grants them new abilities as they acquire a certain number of kills in their Vampire Lord form that benefit their stats and abilities. They gain access to several unique spells, like Vampiric Drain and the ability to turn into a swarm of bats. Vampire Lords also gain unarmed damage similar to Argonians and Khajiit, and their claw attack is incredibly strong by comparison. Magicka regenerates 2% faster, but all stats regenerate 90% slower in daylight than normal. Vampire Lords automatically receive 100 points to their Magicka, Health and Stamina however, they have -60 to each of those stats while outside in daylight. This will lead to the discovery of Serana, who was locked away in Dimhollow Crypt. Escort her home to Castle Volkihar, where her father, Lord Harkon, will offer a unique gift as repayment for returning his daughter to him: an opportunity to become a Vampire Lord.

Regardless of who the player eventually sides with, they'll be asked by Isran, leader of the Dawnguard, to look into what the vampires are searching for.

Skyrim become a dragon