Talk:Synthesis/@comment-7281328-20150406035351/@comment-5422246-20150415133608

They were cloned using Orokin tech, though. I would imagine that the Grineer were originally used as cheap labour, then the Orokin were wiped out and their cloning machinery fell into disuse. Then, eventually, the Queens discovered how to use it.

And that's how the Grineer might have come about!