Monsters Invade, I Transform into an Invincible Green Dragon in the World

Spiritual energy revives, and monsters appear. Luo Yuan was chased by a wolf demon. When he was about to die, he accidentally awakened the bloodline upgrade system. At the beginning, he drew the primary blue dragon bloodline and gained the ability of lightning and self-healing. And as long as Luo Yuan kills monsters, he can obtain monster spirits and upgrade his bloodline. After reaching the highest level, Luo Yuan can transform into the divine beast Qinglong, with endless life and control the power of the nine-day thunder. From then on, Luo Yuan transformed into the Thunder King and embarked on the road of fighting monsters and upgrading. "Let that monster go and let me do it!" "How can you use a knife? That's too cruel. Let's use my electric shock to give it peace!" "You're welcome. All living beings are suffering. I can only do my little bit to make them suffer less."