Always wanted to do a what-if fully corrupted Mael, and what better opportunity to do so than Isgarren's shady little experiments? Introducing codename "Harbinger", also known as Sun Eater, Fenrir, Shadowlord, Bleak Raven.
As a failsafe in case of the Commander ever losing himself to the demon magic he wields, the Wizards ran a simulation of the worst possible future - orchestrating the deaths of all his loved ones, to the point he finally lost himself to madness. All in all, standard fractal business - except, whoops, the real Mael was never supposed to learn of Sun Eater's existence! And Sun Eater was never supposed to learn it wasn't in the real Tyria! Oh no... what's this about scientific hubris...? A little fucking around and finding out, perhaps?
And oh no! Is the former Pact Commander (the real deal) now plotting to assassinate Isgarren as well as trick the Wayfinder, Maolmuire, into slaying him in turn to prevent the possibility of a very dark future? Maybe.
His mental state hasn't been the best in quite some time and this is the straw that broke the camel's back. Except it was several bricks thrown at his head.