- “'Forbidden'? Is that what they're calling my chapter?”
- ―Eclipsa Butterfly[src]
Queen Eclipsa Butterfly, also known as Eclipsa the Queen of Darkness, is a former ruler of the Kingdom of Mewni and Star Butterfly's ninth great-grandmother, as well as Moon Butterfly's eighth great-grandmother. She is first alluded to in "Into the Wand".
Eclipsa has slightly pale skin, short poofy teal hair, grayish-purple eyes, and red spade-shaped marks on her cheeks. She wears a long, black Gothic-themed dress, a large black sun hat with gray and white feathers and a thorny branch, a white cravat with a blue crescent moon on it, gray opera gloves, and black flats with pale purple socks. Eclipsa also has maroon-colored lipstick and black mascara. Underneath her gloves, her hands are dark purple with purple veins sprouting out on her arm.
Little is known about Eclipsa's life or the history of her rule over Mewni, but what is revealed whenever she is mentioned portrays her as the "black sheep" of the Butterfly family, with a dark and/or less-than-respectable reputation.
In the episode "Into the Wand", Star Butterfly travels inside her magic wand and learns about some of her royal ancestors via the tapestries in what she calls the "Grandma Room" of Butterfly Castle. According to a passage inscribed on her tapestry's pedestal, Eclipsa was wed to a Mewman king, but she took a monster with red skin, white hair, horns, and four eyes as a lover and ran away with him.
During her life, Eclipsa developed a number of spells that were (or would later come to be) associated with dark magic, including the All-Seeing Eye. These spells were recorded in the pages of the wand's Magic Instruction Book, and her entire chapter was sealed behind a skull-shaped lock (which could only be opened by Glossaryck) to prevent others from reading them. She is also the only queen who never questioned Glossaryck's teaching methods.
According to Baby in the episode of the same name, Eclipsa had a very high affinity for magic compared to other queens, rivaled only by Star herself. It is also presumed from a remark by King Butterfly that Eclipsa harbored sympathy for Mewni's monsters, a sentiment shared by very few of her fellow Mewmans and royals.
In Star vs. the Forces of Evil: The Battle for Mewni, Eclipsa appears in Queen Moon's flashback. Rhombulus briefly unfreezes part of her body so Moon can make a deal with her in order to defeat Toffee. Upon being unfrozen, Eclipsa asks Moon for a chocolate bar from the nearby vending machine, having gone several centuries without any food, and she sympathizes with Moon since they both lost their mothers at a young age. When Moon asks Eclipsa to teach her a spell that can kill an immortal, Eclipsa agrees in exchange for her eventual freedom, and they form a magical contract. As soon as they strike the deal, however, Rhombulus immediately freezes Eclipsa again. At the end of the movie, following Toffee's defeat and a brief visit from Moon in the present day, part of Eclipsa's crystal prison cracks, hinting at an eventual escape.
- Theme Song (season 3)
- Into the Wand (mentioned/pictured)
- Page Turner (mentioned)
- Bon Bon the Birthday Clown (mentioned)
- Baby (mentioned/pictured)
- Crystal Clear (cameo)
- Star vs. the Forces of Evil: The Battle for Mewni
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- Eclipsa is voiced by Esmé Bianco, who is best known for her recurring role as Ros in Game of Thrones.
- Like the hearts on Star Butterfly's cheeks and the diamonds on Queen Butterfly's cheeks, the marks on Eclipsa's cheeks are also themed after the four suits in playing cards - in Eclipsa's case, spades.
- When in Eclipsa's possession, the royal magic wand resembles a closed parasol with a long handle, and the wand's head has black wings, an orb, and a black crescent on top.
- Due to the possibility of Rhombulus having imprisoned innocent people, it is unclear whether Eclipsa was frozen for being evil or merely under suspicion of being evil.
- Due to Eclipsa's "black sheep" status in the Butterfly family, Star did not know about her existence until "Into the Wand".
- Eclipsa's dark veins are a very common trait in many media with dark-embodied creatures, it is basically a sign that darkness (or similar form of dark magic) is devouring its host. The signs can also symbolize death, if not treated (e.g. Star's mother feeling pain on her arms as an adult rather than at a young age when she had no pain), however, they usually are just a physical trait that symbolize evil.