After defeating Dr. Psyche, David recalls a promise he made in past Glenwood.
(Flashback)
It was at Merchio, the night before the trek to Mt. Killaraus.
"So, Eizen. You wanted to talk to me about something?" David asked.
"Yeah. I wanted to talk to you alone so that no one would overhear." Eizen said. "You could feel it, could you? The malevolence is slowly eating its way into me. I fear I'll become a dragon soon."
"And what's that got to do with me?" David asked.
"If I end up becoming a dragon… I want you to kill me." Eizen said.
"W-what?! Kill you? Do you have any idea what you're asking of me?! David asked.
"I am. I understand that you're hesitant about the deed, but if Edna or Zaveid are unable to do it, you're the only one I can trust to finish the job. I only give this task to people I can trust." Eizen said.
"So, you asking me this, means you trust me, right?" David asked.
"Yes. I want you to kill me before I hurt Edna, Zaveid or anyone else. I would rather die than go through that against my will." Eizen said.
"I…" David said clutching his blade. "I promise. I'll do it the first chance I get."
"I know you will." Eizen said clasping his hand.
(End Flashback)
David is seen fiddling with a familiar coin containing a woman and a reaper.
"Don't worry, Eizen. I promise you, I will put an end to this curse of yours. No matter what it takes." David said.