Cerberus
Cerberus is a hellhound that lives in the House of Lamentation's underground tomb and only obeys Lucifer. He was first introduced in Lesson 8-10 of Obey Me!'s Main Story.
Story[edit]
Main Story and Events[edit]
Cerberus is a family pet of sorts, for it's seen in chat messages that Lucifer often takes him for a walk and cares for him, like a regular dog.(source?) However, Cerberus is implied to be very large, for Mammon commented that he felt hot air coming above him when the story first introduced him, in Lesson 8-10 (OM). His growls were mistaken for Beelzebub's stomach by both Mammon and Beelzebub himself, the latter of which having originally thought Mammon was making weird noises.
Aside from Lucifer, most of the brothers aren't very fond of Cerberus and refuse to walk him. Beelzebub can be convinced to care for Cerberus with bribes from Lucifer, as seen in the chats Caring for Cerberus 1 and 2.
In the Devilgram I Can Do It Too!, it is implied that Cerberus does not have to be fed every day, as Leviathan assumed that since Mammon was supposed to feed him the day before, he shouldn't be hungry the next day.
In Lesson 8 (OM), during the retreat at the Demon Lord's Castle, MC, Mammon, Leviathan, and Beelzebub headed for Lucifer's room to take a picture of Lucifer's sleeping face. MC wanted said photo in order for Asmodeus to enter a pact with them. Upon entering the room, they encountered Cerberus, and found the way they came in locked. They escaped through another door, which teleported them to the castle's underground labyrinth. It was revealed that Lucifer placed a curse on his door that would transport anyone who didn't knock into Cerberus's domain.
When MC, Mammon, Leviathan, Satan, and Lucifer entered the game Dogi✩Maji✩Memorium, Cerberus served as the final boss, as seen in Lesson 10-17 (OM). However, he didn’t recognize Lucifer as his master. When he tried to attack Satan, Lucifer’s wrath comes forth and is able to dominate him in Lessons 10-17 and 10-19 (OM).
After the incident in Lesson 6 (OM) with Luke and the grimoire, Lucifer had Cerberus patrol the House of Lamentation's underground tomb. This is a fact the other brothers and MC did not know when they tried to retrieve the grimoire in order to lure Lucifer out of being under house arrest in Lesson 14 (OM).
Cerberus made a small cameo in Happy Birthday! Dear Lucifer '21, where Lucifer summoned him to attack Mammon for an unpaid bill. According to Mammon, that was very extreme compared to the other times he was punished. However, Lucifer was on edge because he lost the necklace MC had gifted him from his last birthday.