[@Lumiere]

I haven't actually came up with an origin for the Aosta Trees, but magic is involved. Maybe later in the RP we can explore how and why the Aosta Trees grew, it could even be that no sentient being intended to grow them but they was just seeds in the place and in the right time. 

Also, something I should clarify is that Alexander magic isn't radiant. Radiant magic is light magic. Alexander's magic is closer to chi. It is life energy that flows through all living things, Alex just takes the excess energy that is in the air and focuses it. For me, it is less that it is a "good magic" and a "bad magic" meeting, but more trying to pour gasoline in a coal engine. It is just fundamentally incompatible with artificial life. 

Edit- An in theory, the same magics that is used to give your own life energy to heal others could be reverse-engineered to take the life energy of others to heal yourself. Though, at least in Rutan where his particular brand of magic is taught, that is about as blasphemous as say, half or three-quarters as bad as artificially creating life in a test-tube.