: If throwing Balor's head down the world's biggest wishing
: well would supposedly get rid of the Leveller, then
: that would mean that the Leveller is bound to the
: still living head. But what about Mjarin? His head was
: still alive at the time of Balor. Did the Leveller
: leave his head? If so, how and why? If not, then
: Mjarin is still the Leveller while Balor is as well.
: How can this be?
This is just strengtening the fact that the leveler's spirit has a will, and it can abandon the body just like it did with Mjarin when it (the leveller) decided that Mjarin can no longer help. After that Mjarin acted on his own. We already know the leveller chooses the being he seems ideal to destroy the world, it might be the greatest hero cause he has such great powers.
Perhaps the explosion we see in the great devoid is the leveller abandoning Balor? (assuming Balor WAS the leveller).