Dragon Clan: Sign in at the Beginning and Sign in to the Dragon Slayer Crystal

The extravagant feast of dragons, the ancient Roman Colosseum of hybrids. The world is in chaos... Yu Wentuo, an ordinary person, was very unfortunate to be transported into it. Fortunately, the sign-in system is close to me, and destiny is blessing me. On the first day, he brought Yuwen Tuo a dragon-slaying magic crystal containing fire attributes. Looking at the blazing crystal in his hand, Yuwen Tuo smiled miserably. A mere little dragon dares to do whatever he wants, look at my fire dragon's iron fist! Wood big wood big wood big! I am invincible!