Mark spread out his hands widely, staring at the demon horde in front of him. They were still running towards him from a distance, all chained to that unnatural tree. If this continued and he didn't run using a Portal Key within some time, they would be able to get to him.
If he ran in the other directions, he would get too close to the chained giants.
That was why he planned to leave the Demon World using his main body quickly, but before that, Mark also planned to con these desperate demons.
But a good conman has to be a good salesman first. And a good salesman never underestimates their buyers.
He had said he had nine Portal Keys but had only one, and he was not selling that. Thus, he had to sell something that didn't exist, make as much profit as possible with that lie, and then use the one Portal Key in his hand to run away.
Mark asked out loud: "What can you all trade me for your lives, goodmen?"