Reach Liurnia of the Lakes
Go to the Raya Lucaria Academy gate area
Find the Abductor Virgin at the bottom of the waterwheel in Raya Lucaria Academy
Let it grab and kill you
Respawn in the Volcano Manor area
Follow the path out of the cave to reach Volcano Manor
Alternative route:
Reach Altus Plateau
Go to the Grand Lift of Dectus or Ruin-Strewn Precipice
Travel to Mt. Gelmir
Follow the road and climb to Volcano Manor
Enter through the front gate or side paths