As you move into the room you notice that one of the corpses on the table is quite fresh. Fresh enough that parts of it are still moving.
You can quickly ascertain that it's the monster you encountered when you woke up chained to the column. It's head and limbs have all been detached, bleeding off the table into a drain. Apparently large copper nails were used to pin each still moving body part to the table in the north-west corner.
At the door you hear the sound of metal scraping on stone gradually growing more distant.