Question about "Beyond Death" quest

[GoodApollo19]

To enter the soul carin I had Serana trap my soul instead of turning me into a vampire and now that I've obtained the elder scroll from there I need help finding the gem where my soul is being kept.

 

[Derek Jeder]

Go south west of the unnamed castle where Serena's mom is, and theres a maze like room, search the bottom floor for a teleport well thing, and go to the top, in the chest under the giant soul gem is where your soul is.