While Andrew was teaching Little Hela and Hit-Girl, the Nightmare Demon King contacted The Serpent through dream magic.
In the dream realm, the Nightmare Demon King asked, "Serpent, I'm the Nightmare Demon King. Do you want revenge on Odin?"
The aged Serpent sat on the ground with his hair hanging loose and snapped irritably, "Get lost."
"..."
The Nightmare Demon King was stunned. What the hell? This wasn't how it was supposed to go. Shouldn't The Serpent be overjoyed?
The Nightmare Demon King asked, "Serpent, what's with that attitude? Don't you want to get out and take revenge on Odin?"
"A few years ago, a demon king asked me the same question. We agreed that he would get me out, and I would help him once."
The Serpent said coldly, "I was full of hope then. Who knew that before long, another demon king would come along and threaten me? He demanded that I help him once, unconditionally, or he would expose the first demon king's plot.
"To get out, I gritted my teeth and agreed. In the end, nothing happened. Nobody came to rescue me. There wasn't even the slightest sign of a rescue attempt.
"I gave away a promise for nothing and waited like an idiot for months, going from full of hope to utterly despairing.
"Nightmare Demon King, what kind of attitude do you think I should have toward you?"
The Nightmare Demon King was speechless. Where had those two useless demon kings come from?
That sounds like Mephisto and the Mechanical Demon King. Could it have been those two?
The Nightmare Demon King grumbled inwardly. His guess was right: the first demon king had been Mephisto, and the second had been Andrew.
Back then, Odin hadn't been on Earth, so demon kings could contact The Serpent