Stand with the Dawnguard to thwart Vampire Lord Harkon's dark ambitions or embrace vampiric power. The fate of the sun hangs on your decision.Stand with the Dawnguard to thwart Vampire Lord Harkon's dark ambitions or embrace vampiric power. The fate of the sun hangs on your decision.Stand with the Dawnguard to thwart Vampire Lord Harkon's dark ambitions or embrace vampiric power. The fate of the sun hangs on your decision.