Testa-Rossa

Testa-Rossa, the Vermillion Knight (《の》テスタ＝ロッサ), known in legends as "a crimson demon said to wield a thousand weapons", is one of the seven Divine Knights of Erebonia.

Background
It was found in the depths below the Imperial capital Heimdallr, where it was sealed away after the capital was recaptured by the Imperial Family in the fifth Century.

Testa-Rossa possesses the 'Thousand Weapons' system which enables it to summon a large variety of weapons capable of handling any situation.

Testa-Rossa made its first appearance in the series shortly after the Azure Tree emerged in Crossbell, it was then that Duke Cayenne took Prince Cedric to its resting place beneath Valflame Palace where the Prince resonated with the sealed Divine Knight.

After Class VII successfully rescued Emperor Eugent, Empress Priscilla, Elise Schwarzer and Carl Regnitz from their imprisonment in the Karel Imperial Villa, Duke Cayenne summoned the Infernal Castle where he had Prince Cedric held so that he could use him to awaken the Vermillion Apocalypse once more.

Unfortunately right after Crow Armbrust piloting Ordine was defeated by Rean Schwarzer piloting Valimar, Duke Cayenne was able to use the opportunity to force Prince Cedric into Testa-Rossa despite the warnings of the others. It was finally defeated when Rean and Crow teamed up to defeat the Vermillion Apocalypse before it could consume everyone in Heimdallr.

Vermillion Apocalypse
The Vermillion Apocalypse , also known as the Crimson Calamity (の), is a transformation of Testa-Rossa as the result of being contaminated by Zoro-Agruga's cursed blood. The Vermillion Apocalypse uses Testa-Rossa as its core. Upon its awakening in the Infernal Castle, it absorbed the mana from the people below in Heimdallr and was fought and defeated by Class VII.

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Trivia

 * Randy Orlando's ultimate, Zemurian Ore-made weapon from as well as Shirley Orlando's chain saw rifle in  are have been named after the "demon from Erebonian folklore, said to wield a thousand weapons", Testa-Rossa.
 * The Sen no Kiseki The Artbook lists the Vermillion Apocalypse as the Crimson Lotus Demonic God (の), a name that is not used in-game.
 * Its name means "redhead" in Italian. It may also be a reference to the Italian luxury car Ferrari Testarossa, and maybe to king Barbarossa ("red beard").
 * It has only been shown using its full thousand weapons during its S-Craft, Oblivion Arms.
 * When Testa Rossa is fought in, Cedric refers to the weapons as demon weapons referring to its former status as "the Demon that wields a thousand weapons".