Mission \"the Last descent" (Bug) (The Elder Scrolls 5: Skyrim)

As you progress through the mission the Last descent" falls the task - to find a diary Gratsion Kaleria. Went through the mine (the tomb), but in the end, approaching the hall where ideas should be based on the skeleton of Gratsion I do not find his remains, only traces of blood and a sleeping bag next to which potions, purse, etc., have used the cheat to view not lost in the textures, but found nothing...
PS do you Know that the mission starts with a 30-level, but for some reason I had it, and in past times at lower levels I found a skeleton with a blade.