Ascension

The Ascension is a ritual performed by Grandchildren on their prisoners and are possibly one of the steps in turning a human into a Grandchild.

The Ascension is first mentioned in the notes left by one of the grandchildren. When you meet Piotr he tells the player that he just completed ascension but has not yet fully transformed into a grandchild. At the end of episode 1 and immediately before you see yourself for the first time, you find some of Grandmother's flesh on a table as a gift, apparently one of the things you receive for completing the Ascension. The player character seems to have been through the Ascension, as he is deformed in a similar way to Piotr.