"Joker... wait, let me think."
Miao Mu rubbed his chin, thought for a while, tore a sheet of paper from the table, and drew a simple sketch from memory.
"He was a madman with scars at the corners of his mouth. He liked wearing a purple pinstriped suit, with green hair, a white face, red lips, and a sharp, piercing laugh."
The Grim Knight looked at the sketch. It did seem somewhat familiar, and he thought it over carefully.
"As for madmen, I shot one who made explosives at ACE Chemicals, but I'm not sure."
"Then that should be him."
Miao Mu crumpled the paper into a ball and tossed it away. The Joker was dead, so there was nothing else to worry about. A permanent solution.
"There's someone as insane as him and as intelligent as you who wants to drag the entire world into darkness. Tell me, isn't he a criminal?" Miao Mu coaxed maliciously.
"Darkness? What does that mean?"
The Grim Knight turned his head, seemingly not understanding.
Miao Mu pulled a USB drive from his pant leg. "Please watch this video. You'll understand once you've finished it."
He plugged in the USB drive and turned the computer screen toward the Grim Knight.
Miao Mu took out a cigarette, intending to light one up, but then he looked at the explosives and missiles by the wall.
Even without a No Smoking sign, Miao Mu had no choice but to put the cigarette away. This really was a great place to quit smoking.
He could only choose one: cigarettes or his life.
The USB drive contained a basic introduction to the Multiverse, as well as the consequences of falling into the Dark Multiverse.
It also covered the top wanted criminal, Batman Who Laughs.
And the final boss, Barbatos.