Elden Ring PC | Grand Lift of Dectus first activation w/full cutscene, arrival in Atlus Plateau

You need both halves of the Dectus Medallion to be able to activate this left and enter Atlus Plateau. Below are videos on where to get each half.

Location of Dectus Medallion (Left)
https://youtube.com/shorts/hGTGs4LCrKA

Location of Dectus Medallion (Right)
https://youtube.com/shorts/1WjtQ8J5kds

Grand Lift of Dectus
"Grand Lift of Dectus is a Location in Elden Ring. The Grand Lift of Dectus is found between Liurnia of the Lakes and the Altus Plateau (see Ruin-Strewn Precipice for an alternative way between both areas). This location can be reached by following the eastern landmass in Liurnia, heading north through the Bellum Highway."
https://eldenring.wiki.fextralife.com/Grand+Lift+of+Dectus