MTL - Apocalypse: Infinite Evolution Starts from Attribute Allocation - Chapter 370 You see they are not interested!

... explained: "There are few slaves at the dark energy level, and there are only so many slaves on the battlefield."

   "You are a general, you should know that it is easy to kill the enemy, but the requirements for slavery are too high."

   "Still enslaving the dark energy level."

  Of course Wang Ye knew.

   You need to have a big advantage on the battlefield, and you must have a very high attainment in enslavement.

  The soul can't be weaker than the enslaved, ...