Envoys are spiritual beings, called forth from below by Magic Law practitioners. They can perform many different functions, but they are mainly used for sentencing ghosts.
In order to summon an envoy, a practitioner must make a contract with the envoy that they wish to summon. This can be either with tempering (the energy used to conduct Magic Law) or with flesh and blood (which are only able to be used when one invokes the Bells of Troy). With flesh and blood contracts, the practitioner can summon stronger envoys and the envoys that he/she summons can become stronger (for example, Seven-Faced Dog being able to turn into inorganic objects). Flesh and blood contracts have a side effect: Envoy syntony, which causes the practitioner to suffer the wounds of the envoy.
- Ghost Hand-Strike
- Yuuri - One of the "Four Sages"
- Admiral Below
- Magiron Men
- Seven-Faced Dog
- Isabi - "The Mountain King", who is actually a forbidden magic law practitioner who changed himself into an envoy to obtain eternal life.
- Smithy of Hades
- Pakero - Prince of the Plutonian Sea
- Black Flame Lizards
- Cave of the Tigers
- Birdcage of the Six Kings
- The Demon Hearse