The witch first appeared in the prologue "dream" sequence of Episode 1, although it wasn't called by any name back then. This led to some speculations about the witch's identity before it was finally revealed in Episode 10.
For a compilation of historical, mythological, and literary information concerning Walpurgisnacht (ワルプルギスの夜 Warupurugisu no Yoru, Night of Walpurgis), a term first mentioned by Homura in Episode 6.
Walpurgis Night is not a typical witch. Instead, she is a conglomerate of many witches fused into one. It is not explained how or why this fusion happened. Walpurgis Night has so much power that she is not confined within a barrier like most other witches. Instead of harming humans with a Witch's Kiss, she can wreak havoc directly with her powers, and can completely obliterate an entire town if not stopped. Thankfully, she appears very rarely. She is ostensibly the most powerful witch and a whole team of magical girls is needed to defeat her, though even her power is dwarfed by the godlike Kriemhild Gretchen, the witch form of Madoka Kaname.
"The stage-constructing witch (alias: Walpurgis Night / real name: unknown); her nature is helplessness. She symbolizes the fool who continuously spins in circles. The witch's mysteries have been handed down through the course of history; her appellation is "Walpurgis Night." She will continue to rotate aimlessly throughout the world until she completely changes the whole of this age into a drama. When the doll's usual upside-down position reaches the top part of the witch, she completely roils the civilization on the ground in a flash through her gale-like flight."
Walpurgis Night can be defeated, but with much more difficulty than any other witch. Only a team of magical girls can stand a chance, and even then it's likely they will suffer heavy casualties. This is what happens in the previous timelines (later undone by Homura).
In the main timeline of the show, Walpurgis Night is not technically defeated. She is instead erased from existance along with every other witch past, present or future when Madoka makes her wish.
Powers and Abilities
Walpurgis Night displays power way beyond that of a standard witch. Notably, she is resistant enough to damage to easily shrug off hundreds of attacks from heavy artillery. Walpurgis Night can spit fire (a reference to the festival she is named after) and shoot homing magical projectiles at her opponents. Her familiars are silhouettes made of space and stars which resemble magical girls. Her appearance is preceded by a parade of colorful minions, fitting her nature as a witch of spectacle and festivity.
- Walpurgis Night is named after Walpurgisnacht, a traditional festival celebrated in spring in parts of Central and Northern Europe associated with witches. This festival is celebrated with dancing and bonfires.
- Walpurgis Night is a term first used by Homura in Episode 6. Due to the lack of information on its subject, and due to the overwhelming imagination of fans, a lot of information about "Walpurgis Night" had been gathered during broadcast. This article is then a compilation of historical, mythological, and literary information concerning this event.