The Entombed Will attacked the Kon the Wizard. He has been at Sleepers Peak at the time is was made into the Peak of Storms and he killed the wizard for making the sword that caused all that. He is how he is now as punishment for that behavior. Although...even I as a Helian support what he did.

As for the Shadow Dragon. Many dragons where slaughtered then the school at Draak was destroyed. I would assume that the Shadow Dragon might have been an exceptional slain warrior that the Aegis took pleasure into turning into a slave.