Copper

The thought of making such a high-level card just for an exercise routine was so absurd that Chen Mu wanted to slap his own mouth.

Chen Mu again remembered his own speculation when he had completed those actions himself and the figures darkened. Could that be the first step? 

Right! The first step! That's what the old voice said at the time, "The first step is to please complete the eighteen actions!" It looked as though there might be some other new mystery behind it.

He had been scared by the card himself. He had to travel around such a huge bend to become clear about such a simple problem. Chen Mu mocked himself for having only just then cleared up the logic of its thinking.