Contract Mark

Lore & Background

The source details that Ciel made this Faustian contract with Sebastian after being enslaved by a cult and scheduled for ritual sacrifice. During a session where his twin brother was sacrificed, Ciel summoned Sebastian instead of the cult, commanding the demon to kill everyone in the room. The mark on Ciel's right eye (usually covered) is the sign of this pact, which binds Sebastian to serve as a demonic butler until Ciel exacts revenge upon those who humiliated and tortured him and killed his family. In return for fulfilling these orders with great loyalty and swiftness, Ciel promises his soul. The contract mark on Sebastian's left hand allows the demon to locate Ciel whenever the master's mark is exposed, ensuring he can appear at a moment's notice.

In Their Own Story

The narrative describes a specific turning point prior to the main series events where Ciel was captured by a cult. Before meeting Sebastian, Ciel was scheduled to be a ritual sacrifice; during this session, his torturers sacrificed his twin brother. It was then that Sebastian was summoned. Ciel made the contract instead of the cult and commanded the demon to kill all the people in the room. From that day forward, Ciel devoted his life to finding the responsible parties. The mark serves as the binding agent for this vow: Ciel binds Sebastian to his will to make them suffer the same pain they inflicted on him. While the source does not describe a specific moment of the mark being formed visually, it confirms the location (Ciel's right eye under a patch; Sebastian's left hand) and the condition that the demon must abide by Ciel's will due to this seal.

Reader's Guide

To understand the mechanics of the Contract Mark, one must look at the specific conditions set in the source. The mark on Ciel is located on his right eye (covered by a black eye patch), while Sebastian's mark is on his left hand. This connection allows Sebastian to find Ciel wherever he is whenever Ciel's contract mark is exposed. The primary function of this seal is to enforce the terms: Sebastian must serve ten-year-old (later thirteen-year-old) Earl Ciel Phantomhive to exact revenge upon specific people. If the conditions are met, the contract ends. The source notes that Ciel made the contract after his twin was sacrificed, binding Sebastian to kill the cultists and later serving as a bodyguard.

Did You Know?

• The name 'Sebastian' was given to the demon by Ciel after the contract was formed, taken from the Phantomhive family's late black Borzoi dog.
• Ciel made the contract with Sebastian during a cult ritual where his twin brother had just been sacrificed as part of the ceremony.
• Sebastian can locate Ciel at any distance specifically when Ciel's contract mark on his right eye is exposed.
• The contract binds Sebastian to serve Ciel until he exacts revenge on those who killed his family and humiliated him.