Look what I finally got off my butt and did.
Originally slated to be the evil force the Piper and Lillian and all their friends fight at the end of their story, the Grand Meister now has a staring role in Narcissa's as well, and is a behind the scenes force in Nora's too. I bet if I tried, I could work him into Amarante's as well, but for now, we'll stick with what we've got.
Every 1000 years, one Dream and one Nightmare can ascend into our reality. 1000 years ago, The Grand Meister appeared in the desert of Darnesia where he combated, and ultimately failed against the Piper and was banished to a shadowy realm until he established contact with a woman named Izbel who he manipulated into freeing him. Not gonna go into details, but of course, Lillian and the others defeat him, once again trapping the ascended Nightmare in his shadowy prison.
1000 years after his ascension, another Nightmare arises, taking on a similar form to the ascended Dream and calling herself Belladonna. Belladonna endeavors to free the Grand Meister once more in order to act out a plan 2000 years in the making. Again, not going into details, but she too is defeated by Narcissa and her friends.
Finally, a world away, a totally different battle is waged, and the maddened princess Nora is banished into the same shadow realm as the Grand Meister, followed by her loyal adviser the Priest Eliezer. Through forces I once more shall not go into detail about, Nora and Eliezer escape from their prison, unknowingly carrying pieces of the Grand Meister's spirit out with them, furthering each of their insanity.
EditYes that cobra there is his tail, but it has it's own brain and the two heads converse with each other, not quite separate personalities, but almost.