Adam knew that the Joker wouldn't have allowed him to take the eight golem cores with him to the outside world.
He speculated that these golems served as security for the secret plane. The youth didn't know how many golems the Joker had, but knew that these cores were simply too valuable to part with.
"What proposition?" The Joker growled. "If it's about getting your hands on any other items in this vault, then no!"
"Hehe," Adam chuckled innocently. "Sir Joker, I defeated those golems by myself, so shouldn't I be rewarded with their cores?"
The Joker reprimanded, "Your reward for defeating the golems was the knowledge about the portal on Luna! I have given you more than enough. Do not be greedy, lad!"
"Calm down, calm down." The raven-haired youth raised his hands in surrender. "I'm not saying I won't return the golem cores. Of course, I will. I mean, they belong to you, after all."