Obliging with Nergal's direction, Mephisto is tasked with carrying out what they discuss whenever needed. He acts as Nergal's right hand, Mephisto is loyal to him and checks what Deus and Beryl are doing quite thoroughly, having his ways of being intimidating or scary with a simple look or by using his abilities... Mephisto has his own library, he currently is in his quarters which is just a room away from the library - both counting as his own.
Nergal just left after some talk, Mephisto's focus is back at the paperwork he's been working on before. As an alchemist, while being able to cast sorts of spells or recharge mana, he also has some sort of experiment obsession.
He wears a coat in white, like that of a doctor or professor, his left eye is black because of the tentacle monster he was... Forced to absorb. A monocle is over his left eye, his right eye is normal, both red irises have slit pupils as he is focused on writing.. His dark shirt is stuffed into his high waist trousers in black. "Awfully boring... At this rate dark fall might truly become less demonic." One of his many purple tentacles extracts from beneath his coat, inside his body and reaches for a vial, he inspects it as the tentacle holds it in front of his face at will before setting it down and retracting his tentacle beneath his coat inside his body again.