Shadowslash wanted to capture large amount of Saint corpse, especially from the insect tribe of the outer world, he felt his Lunar and Solar Rune Scarabs only need a little bit of push to finally evolve and break the limitations of their kind.
The usage of the Primordial Rune Scarabs are becoming lesser as his strength increases, he mostly kept them as training partners for people under his family that were taught the family secret technique.
Heaven Swallowing Technique.
The lesser version might be popular almost to everyone but the true version is kept by him and his family, besides, the requirement for one's physique is extremely taxing.
Most humans and elves cannot train the true technique because their body cannot handle the burden, meanwhile, the beasts that had awakened their ancestral bloodline could train it's early stage.
