Tower Defense Around the World, My Dragon Can Be Upgraded

In this world, zombies, zombies, banshees, bat demons, vampires, giant spiders, slingers, hydras, goblins, skinned monsters, nail-headed monsters, bloodthirsty giants, and various monsters will swarm in every night. Human beings can only rely on various fortresses to survive. As long as they reach the age of fifteen, both men and women must become warriors. Each person will be given a tower defense seed and can open a tower defense base by themselves. Hundreds of thousands of tower defense bases are being built every day, and many are breached every day... Lin Xiuzhe's tower defense seed unexpectedly mutated, and he was able to produce dragon-type creatures! Others were just a pea shooter, but he made a raptor with steel and iron bones and was as fast as the wind! The key is that they can be upgraded. Each one of them is shining with golden light, and their speed, power, defense and attack power are all increased by 300%... The Tyrannosaurus rex roared loudly, biting off half of the bloodthirsty giant in one bite... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.