Soul shards

Apparently a major aspect of the world, the shards aren't fully explained. We know they're a major source of power, but different religions interpret them in different ways. Even Riala isn't very certain about them, only saying, "It really is a piece of a soul, or at least similar to one. Whose, I couldn't tell you."

When taken, the shards merge with someone's soul and grant them power, including sexual dominance. Riala says she couldn't use the one she found, but it's uncertain why. Given that all the holders seen so far are male, and that people are allegedly curious about Esthera, it seems likely that shards cannot be taken by anyone, possibly women or succubi (or maybe it's because the traditional machist point of view that says than women cannot hold power). Under normal rules, anyway.

Known Shards
There are roughly two kind of fragments: the major ones and the minor ones. Logically, the major ones gives their hosts more power than the minor ones, but the latter shouldn't be underestimated because there are a high number of them (Simon had already had found various in his journey) and their owners has more probabilities to keep them under the radar.

Major Fragments
Not all pieces are the same size. Simon's is relatively small and Riala implies there are five that are substantially larger than the others. Exactly who possesses these five is still unknown but some of the holders above are likely among the five.


 * Incubus King
 * Esthera (Empress) - how she got/holds hers seems to be a mystery of some kind.
 * Lustlord
 * Estaven (Fucklord)
 * Anak
 * Lord of Blood
 * Skulcrusher - ex-owner presumably

Minor fragments
A owner of a small fragment can absorb others, increasing his/her power, but increasing the likehood of being detected from the Major ones and be eliminated.
 * Simon
 * Cache in the Delgar Forest.
 * Cache in the Devil's Pass.
 * Cache (undetermined localization): invest with the guy in the Miners' Juction.
 * Armor from the fortress - Riala says the armor was forged from a small fragment.