I Used a Gourd to Feed the Mythical Beast, and Accidentally Became Invincible

After traveling through the world of immortality for sixteen years, Lin Bufan is still a sweeper of the Beast Control Sect. The monsters shake their heads when they see him, and he is known as "the fighter among the losers"! He was bullied by the stewards and ridiculed by his classmates, but he endured it! Until one day, he dug out a mysterious green-skinned gourd from the mud... "Ding! Your [Mythical Beast Development System] is online!" What? If you throw a dying native dog in, it will come out as a barking dog (fake)? ! Throw a trembling little rabbit in and come out as a blue rabbit that can spray water arrows? ! Throwing the stone eggs you picked up, what hatched turned out to be... An ancient dragon? ! From then on, Lin Bufan, with a gourd in one hand and a mythical beast in the other, embarked on a counterattack path in which he could become stronger even by "picking up garbage"! Waste? That was before! Now, even the Immortal Emperor has to take a detour when seeing my legion of divine beasts! Not convinced? First, ask about my dog ​​Dan's teeth, then try my little blue's water arrows, and finally... Meet my little loach that likes to slap people with its tail! (Easy + cool writing + mythical beasts + cultivation + single female protagonist)