Everyone's an Overlord: I Have the Military Unit Editor! EVOIMUE

On this day, everyone transmigrated to a parallel world overnight and obtained a territory that belonged to them.
However, there were countless monsters roaming the forests outside of the territories. These monsters would raid any foreign race that they came across.
Thus, to survive, one had to build up his territory as soon as possible. He had to strengthen the defenses and build a powerful army to resist the invaders, before moving to occupy a larger territory.
Rene was one of those who transmigrated to this world. The territory he obtained was small and did not have any soldiers who could fight.
However, he suddenly obtained a miraculous system — the Military Unit Editor.
[Archer] + [Bull Muscle] = Tauren Archer!
[Minotaur] + [Walking Corpse] + [Vampire Fangs] = Bloodsucking Demonic Bull!
[Centaur] + [Flame] + [Iron] = Flaming Centaur Knight!
[Forest Fairy] + [Holy Light] + [Harpy's Wing] = Sun Fairy!
Thus...
Countless strange military units appeared in his territory.
The Overlords that he conquered all had shocked expressions when they saw those units.
"Oh f*ck! Why are the muscles on that archer bigger than those of my berserkers?"
"What's with those minotaurs? Their axes can create illusions!"
"Why are the muscles of the fairies in the forest so exaggerated? What happened to them? Aren't they supposed to be the most beautiful species?"
"Please help me, my territory has been surrounded by slimes covered in sh*t! I can't take it anymore, please save me!!!"