I’m a Legendary Boss

What if he transmigrated and became an NPC? This thought took root in William’s mind! Hence, he decided. He wanted to become the strongest NPC in history. The thickest armor, the cruelest beating! Who said that NPCs would be killed by players? Who said that NPCs would level up slower than players? Who said that NPCs must drop equipment? I can drop even more…Pui, pui, pui. Anyway, it was impossible for him to die. He could only fool the players and muddle along with the NPCs. " Hey, Chosen One in front, please hold on. I see that you’re not afraid of death. Peerless Iron Head, how about I sell this Legendary helmet to you for 100,000 gold coins?"