When i have to follow the person in to the tomb he isnt there and there is just a small room with no where to go?

I have the same problem mate - according to a youtube video he is meant to cast a spell on the statue at the back and open up a door way but when i walk through the door he disapears into the void (according to his map marker)

Would also like to know how to go about fixing this, I dont want to reload back so far.

Yeah... I got the same problem... But for the PC! That's a shame, the quest seemed to be absolutely awesome!

Yep happened to me all i found out is you have to reload a save from before to fix it. Seems a real pain and its not a hidden glitch that doesent affect anything its a major one that disrupts a side quest.