Cuttlefish That Loves Diving
considering how much provocation he has done over the years, his sequence 8 potion should be instantly digested otherwise cuttlefish would be breaking the rules he set in the first book.
Lumian might not be so apathetic and ruthless as some of you guys think he is. I also originally thought of him like that but him rushing forwards to see if Ava was still alive or not and the novel mentioning that he was traumatized by the shepherd proved that he still cared about the other villagers and is not apathetic. Heh, he's just a tsundere.