Race Slaughter, My Arms Branch Can Be Infinitely Synthesized

Donal traveled to a world where tens of thousands of races coexisted and killed each other, but he only summoned the lowest level of arms branch. He might die at any time.

When he was in despair, he found that his arms branch could be synthesized.

LV. 1+LV. 1=LV. 2 goblin.

LV. 2+LV. 2=LV. 3 goblin.

...

While others were still wondering how to upgrade, Donal had already led his senior military regiment to fight around...

"Damn it! How could he develop so fast? He must have cheated. Is there no one to discipline him? If it goes on like this, he will rule the world!"