This here is our little lad Merlok, undergoing his transformation for the first time.
See what happens, is an excess of Adrenaline triggers the creator cells in his body to begin creating new cells... which form into these wings.

Entirely natural... just very unusual.

Newly formed bones rip through the flesh on his back, then nerve cells and skin tissue slowly grow around those bones. The process is extremely fast, but also incredibly painful.

... and this here is Merlok's first time.