So you want to be a bloodsucker, a fiend of the night, a vampire?
You're in luck my friend, this guide has the answers you seek. You will have to search out rare spawns that only spawn at night, at one of these locations sorted according to your alliance. After that you complete the questline that follows and you may crown yourself vampire.
Daggerfall Covenant (Bangkorai)
Location one
In game view
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Location two
In game view
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Location three
In game view
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Location four
In game view
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Ebonheart Pact (The Rift)
Aldmeri Dominion
V Quest giver location V
Quest to turn into a Vampire (Also Pictures)
This section is step by step guide of the quest to become a vampire
When you go to the locations and find the bloodfiends (or whatever mob it is for the other zones) just let them hit you and you should be infected right away with Vampirism. Before they would not respawn, folks have been saying they do respawn now however I suggest leaving them alive for others.
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Next you will want to teleport to Easter Evermore Wayshrine for DC, I will try to find the Wayshrine names for the other two factions when I can.
The man you want to talk to is Vorundil, he will appear when you are infected with Vampirism.
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He says
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After you have talked to him you can either go to town and be cured for free or venture on to find out what this creepy blood sucking business is about. If you choose that later you will want to go to the Vampire shrine south of the Wayshrine, it will be on your map.
Now that you made it you talk to Rahaja.
She says
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Praying at the alter will bring you to Blood Matron's Crypt. This is also the alter you turn other folks into vampires.
When inside go speak with Rahaja again to continue the quest.
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If you talk to her a second time she says
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Drink from the first basin and you will be treated to a scene with this nifty dialog.
After which you will destroy the symbol of Molag Bal
During which you get this dialog
Drink from the second basin for another scene and another dialog
After which you got to the symbol of Arkay and destroy it
she will talk to you again
Now you go into the black pool and get the life sucked out of you
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After which you finally get to talk to Lamae Bal face to... well since she floats, knee caps. Also must say, incredibly odd fashion choice for the Mother of Vampires... but who am I to judge, I run around in the Seadrake outfit from the starter zone.
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Also this dialog
Now you are tasked with taking out them darn cultist that somehow found their way into this super secret crypt... yeah. The Cultist are all 42 by the way.
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So pretty much look for these guys, there are ten in total, sorry I didn't mark them on the map but now is your time to shine and explore on your own! Go on, I won't be here to cuddle you forever... on the other hand, once I'm a vampire I technically could be here forever.
Came across this guide on the official ESO forums. It's a gem, very comprehensive.
Original post: Vampire Guide, everything you need to know! (ZOS please read the cured section) - Elder Scrolls Online
Curing yourself costs 681 gold. The vampire quest can be done by anybody lvl 12 or above (roughly) BUT you will need to kite/ be very careful. lvl 38 is the game's 'suggested' level.
Hope it helps people out