As a devil familiar, Slotos appears as a small, dark-colored figure with horns, wings, and a tail.
After Nacht Faust interrupts a captains meeting, he summons four masked beasts to stop the captains from attacking him, with Slotos holding back Jack the Ripper. After Julius Novachrono vouches for Nacht, the captains relax and the beasts disappear.
When Asta defeats Liebe and insists on forming a contract of equals with the devil, Slotos appears alongside Gimodelo and the other devils. The devils cling to Nacht's head and shoulders as Nacht enters the circle and compliments Asta's choice. Slotos and the other devils disappear when Gimodelo merges with Nacht to continue Asta and Liebe's training.
After Nacht admits defeat, he leaves behind Gimodelo to continue Asta and Liebe's training since their union needs more work. The devil is terrified of the possibly lethal attack again, and Nacht's other devils comfort Gimodelo.
While fighting Dante Zogratis, Nacht summons Slotos and merges with the devil in order to withstand the increased gravity and to buy time for Jack the Ripper's Slash Magic to adapt. When the roots of the Tree of Qliphoth suddenly grow, Nacht switches to Plumede.
After the first gate to the underworld opens, two highest-ranking devils—Lilith and Naamah—appear in Dante's chamber, so Nacht pulls them into another part of the castle and traps them in his Dark Prison Hunting Ground. Nacht dodges around the devils' attacks and positions himself behind Naamah. He switches to Slotos and kicks Naamah's back, but his leg passes through the devil's torso as it turns into fire. Naamah then destroys Nacht's left shield, so Nacht returns to focusing on dodging.
- Toughness 「剛健 Gōken」: When Slotos assimilates with Nacht via Unite Mode: Equus, Nacht's physical resilience is greatly enhanced, allowing him to withstand and move in immense gravity.
- Black Clover Manga — Chapter 278 (p. 4).
- Black Clover Manga — Chapter 287 (p. 3).
- Black Clover Manga and Anime — Chapter 263 (p. 3-7) and Episode 168.
- Black Clover Manga and Anime — Chapter 263 (p. 4-5) and Episode 168.
- Black Clover Manga and Anime — Chapter 270 (p. 7) and Episode 170.
- Black Clover Manga — Chapter 270 (p. 11-15).
- Black Clover Manga — Chapter 273 (p. 12-13).
- Black Clover Manga — Chapter 278 (p. 4-9).
- Black Clover Manga — Chapter 279 (p. 5-7).
- Black Clover Manga — Chapter 285 (p. 10-12).
- Black Clover Manga — Chapter 278 (p. 5-8).
|Lucifero • Megicula • Lilith • Naamah • Lucifugus|
|Gimodelo • Slotos • Plumede • Walgner|
|Asta • Nacht Faust|
|Dante Zogratis • Vanica Zogratis • Zenon Zogratis|
|Asta • Charmy Pappitson • Finral Roulacase • Gauche Adlai • Gordon Agrippa • Grey • Henry Legolant • Luck Voltia • Magna Swing • Noelle Silva • Secre Swallowtail • Vanessa Enoteca • Zora Ideale|
|Gimodelo • Liebe • Plumede • Slotos • Walgner|