There are points so unfathomably far beneath the surface of the moon of Luclin that they can only be referrered to as The Deep.  Under such pressures and so far from the nourishing warmth and light of the sun breed beings so incredible and alien that they defy all logic and comprehension, and yet even those beasts are more understandable than the hideous thought horrors that infest the core of the moon.  No one is sure if they are native to Luclin or not, for these beasts are not entirely corporeal, existing between reality and thought, but one thing is quite well known : they are ferocious, paragons of physical and mental power, and utterly evil.  And at their core is the Overfiend, who unifies all their minds in a network hive of thought and animosity.  What their end motivations are none can say, and those who have encountered them hide their thoughts on the matter as well, for they know the horrors of The Deep may be listening...