Hecadoth

is the eighth in the hierarchy. His name probably derives from the Greek goddess. He begins his attack on Oga and the others by imprisoning Kunieda with the intention to use her blood to forge a demon contract; it is understood that the already powerful demons increase their power in the human world considerably if they find a contractor. It seems that the contract itself is not necessarily consensual.However, Hecatos looks down on Hilda and Oga and, instead of proceeding to seal the contract, he allows them to have a shot at him. The two succeed in surprising him with Oga's Zebub Blast, while Hilda releases Kunieda. Hecatos, who had planned for that, uses the opportunity to impale Hilda with his spear, putting her out of combat. He then proceeds to face Oga, and is only prevented from killing him by Saotome's intervention, whereby he is sent back to the demon world. His spear fails to kill Hilda thanks to Kunieda's first aid and Dr. Rachmaninorr's timely intervention, but it puts the demon maid out of action for some time, since it has the property of diffusing demonic powers around the wound.

Later, Hecatos meets Hilda again, but this time she is at the top of her powers and unhindered, and attacks him fiercely. Before he can retaliate, Oga arrives from his training with Saotome and takes up the fight from Hilda. He defeats Hecatos easily and the demon is the first victim of the Zebub Emblem