Al-Qaus Kauza (黒磁鎧甲 （アルカウス・カウーザ）, Aru Kausu.Kawuza, Black Magnet Armor) is the Dark Household Vessel of Isaac. It gains its power from the Dark Djinn, Dunya Musta'sim. Al Kaus Kauza repels the strong magnetic forces between the Earth's surface and its armor. This results in superhuman acceleration.
- The name of this vessel is a corruption of the Arabic phrase كُوز القَوس Kūz Al-Qaus, meaning "Vessel (specifically like a mug/jug/tin) of the Bow (of an archer)" or "Vessel of Sagittarius".