Now, I don't know if i choose the right category, because I couldn't find "Bug Reports".
So, i killed Balreth, it all went ok, good battle, but, once I killed him, I should have absorbed his spirit, well that doesn't happen, Balreth dies, and his cadaver will just stay there doing nothing, and there will be a quest marker that doesn't point anything.
Fun thing is, I had already killed balreth in a beta like 2 months ago, and there were no bugs.