The Seventh Gate by Margaret Weis & Tracy Hickman (Death Gate 7)

This is the finale of the Death Gate Cycle. It is a pity it is over, I would like to read more from this fascinating world.

It kicks off with the undead and Lord Xar, and a mighty battle at the First Gate of the Labyrinth and much will be revealed before it is over.

If I were to sum up the series it would be to say that it is mostly about human shortcomings and the enemy within us all beside being a true epic tale.