Universal Summoner: I Can Synthesize Infinitely

Wu Xian was reborn in a parallel world, but this world was an era of universal summoners. Everyone can awaken their own arms, including humans, undead, dragons, elves, orcs... While others were slowly upgrading their own units, Wu Xian discovered that he could directly combine them. Three first-order directly synthesizes the second-order, three second-order directly synthesizes the third-order... Just when I thought that the plug-in was all there was to it, a new plug-in "Holy Spring" appeared, offering an unconditional upgrade. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.