User blog comment:ND999/Daemons of Runeterra/@comment-25996306-20150711174813/@comment-4664737-20150712061123

Speculation 1: Magical constructs are fueled by souls of a sentient creature regardless of species. A magical construct is merely a vessel fueled by a soul scraped with any semblance of its former life and fed with false memories and directives? Like a pseudo-sentient Servitor.

Speculation 2: Maybe the rerason why Tahm Kench doesn't interact with Sion or Urgot or any Shadow Isles champion is because they don't fall into his territory. The undead or things brought back by Necromancy are beyond his grasp. While Amumu is indeed undead, the means he was brought back to life may be more similar to the Sun Disc's Ascending power than Necromancy.

Speculation 3: Undeath and Necromancy is the territory of another more powerful demon. The fall of the Shadow Isles, according to Kalista, was a result of the King's grief. Perhaps seeking to being back the dead loved one, he made a pact with an ancient demon or a similar entity who then proceeded to tear apart the balance between life and death and made the Shadow Isles what it is now. As proof of this entity's power, it can send its minions on the hunt and overtake the entire make-a-pact-and-consume-their-souls agenda and instead forcibly reap souls because it already has a strong foothold on Runeterra.

Speculation 3: Demons and faeries are two different faces of the same coin. A meta-physical race whose appearance vary depending on the person summoning them. No doubt cunning and deceptive, they will take on the shape of what could aid their efforts the most. While they are fickle and untrustworthy, this race will bow to the strong of will and will tear apart their patrons the moment they see a crack in the armor of their souls. As far as Pix goes, he seduced Lulu into their realm and played with her games that had a totally different description than what games we think it would be. Maybe the reason why Pix follows Lulu is because she passed the test. Assuming that Beatrice is a demon, her deal with Swain is no doubt a result of Swain's strong will which bound the two to each other. Respect is a major thing and as long as any of this race holds a high regard of someone, they're on their good side. Fail and they will turn against you.