I got to a stage 3 with some black dude, i think i gotta steal his blue orb from the head but idk how
1 - From the start point go into the big room (careful here, the gravekeeper patrols this room by walking counter clockwise in here)
2 - When in the big room go left and into the room there, there 3 books on the ground which you need to read.
3 - in the same room there are paintings on the wall with ghost like figures on it go near them and MC should think about something.
4 - when you have control over her again search for the now slighty glowning cloth in the room on the side wall near the wall with the paintings.
5 - Now go out of this room and in the room on the opposite side from the room you just left. since the gravekeeper walks counter clockwise i'd recommend you do the same to get to the room.
6 - when entering the room you will see 2 sarcophagus in the back, the right one you will need to hide in but before you do that take the charcoal on the table.
7 - then hide like i said and wait until you hear the gravekeeper walked in and out of your room again. you can't miss his mumbling and steps.
8 - Leave the room again but be careful not to run into him, cause sometimes he can stop for a second to stomp on the ground for whatever reason he might have. And go back to the room with the ghost paintings and interact with it again.
9 - you will automatically disguise as a ghost and when you leave the room you will gain an imortal mighty ghost buddy.
10 - walk up to the gravekeeper and enjoy the show.
11 - walk over to the blue gem from the dead man and pick it up. walk up the stairs in the room and put the jewel in the place.
12 - All done stage cleared.