Lucien was left standing in the middle of the room, contemplating on what he should do. Even if he tries to find the key to open, it was still useless because of the chains left outside.
Lucien felt that he should leave this room as soon as possible and go after Keith. The mystery of room changing cannot be answered, because it's all up to the game how it set the location.
But usually… if one or more players are in the same location, the set up should not change right? Why did it specifically changed right after he wake up?
Lucien decided to ponder on these things later and should think of escaping first. Lucien habitually touched the black circle tattoo on his wrist and let the crescent blade out. When the sharp blade was exposed, it immediately emit the dangerous demonic energy.
Lucien used the blade to break the lock of the door. His blade is strong. It has demonic energy so a door like this wouldn't –
