The Beginning of the Era of Monsters and Flying Swords

What is this story about? It was a person who traveled to the era of monsters and contracted an ordinary long sword for some reasons. Then, he awakened to a system. The system gave him a Sky Forging Hammer and a Dragon Mace. Then, he was awesome. He had a Sky Forging Hammer, and when others were struggling to upgrade the weapon, he upgraded it several times. After someone finally successfully upgraded, they wanted to take revenge on him. As a result, he took out his dragon mace and knocked off their weapons and spread their ashes. However, he still doesn't know how many people want to kill him, and he keeps arguing that he has no enemies all day long. Of course not, the enemy won't survive more than three days! It's so strange! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.