The Bloodstone Chalice - p. 2 | Vampire Lord path TES V: Skyrim - Dawnguard Guide
Last update: 11 May 2016
Killing the enemies on your way, go up the stairs. There you will find a chain which pulls up the grate visible through the hole in the wall. Behind it you will have to fight a vampire master and his minions.
After they're all dead, head further on until you reach a spot with a hanging skeleton. The further road leads through the gate on the right.
Behind them there's a corridor filled with traps which are activated by buttons in the floor. You better don't step on them.
The tunnel will lead you to a bigger room, where you will be attacked by a group of vampires led by Venarus Vulpin.
Defeat them all and pick up the Redwater Wellspring Key lying by the leader's corpse.
Using it you will be able to easily open the door leading to the well cave. Fill up the chalice with the red water and listen to the conversation between two vampires. They will attack after they stop arguing.
After defeating them, collect some blood from one of the bodies. You can now return to Garan Marethi and end the mission.