Official Canon Edit
TTS Canon Edit
Miriael is extremely frustrated that nobody takes her seriously. Despite the distinction of being the sole Sister of Battle to willingly join Chaos, she is constantly upstaged by the more commonplace Chaos Space Marines. Her frustration is a major source of pleasure for other Slaaneshi cultists, which only makes her even more angry.
Miriael appeared as a guest on Lucius and Ahriman's Slaaneshmas special. At first she was confused and insulted by Lucius strange antics, until Ahriman told her that it was Slaaneshmas. Embarrassed that she almost forgot, she doned a Santa hat and quickly joined the fray.