How to regain entrance to the Soul Cairn

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So I started the quest "Beyond Dead" and talked to Valrice, then I went to kill one of the guys but died. I got mad and left the Soul Cairn, but later I decided I wanted my wolf powers back, so I talked to Aela and got back my powers.

Now I want to go back in but it won't let me. What should I do? I'm working for the Dawnguard not Harkon.

Best Answer

TL;DR:

  • As a part of the Dawnguard questline, you have an option to be soultrapped by Serana, allowing you to enter for the first time. This is not available after you leave upon the quest completion
  • To enter again, you must become a Vampire Lord. You may need to "Rank up" to a level 2 Vampire Lord before being able to re-enter, but you should be able to re-enter at will.

From the wiki

One cannot enter the Soul Cairn without being a vampire or being partially soul trapped. Being soul trapped causes the Weakened Soul ability to activate, which decreases Magicka, health, and stamina while in the Soul Cairn. This can be negated after completing Chasing Echoes and talking to Valerica, who will instruct the Dragonborn to find the Soul Essence Gem. Upon doing so, all stats will return to normal.

Unfortunately I couldn't find any clear indications that you can become soul trapped again to re-enter. Becoming a vampire again seemed to be the only option, as Serana will no longer give you the option to become soul trapped again.