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Actually, kino idea. While lunaitos are human, luknights are just these wild apes stuffed inside the armors which inhabit the souls of lusquires who passed the training.
After the training is done, the poor lusquire is sacrificed in a ritual and their soul captured in an armor specifically designed for them. A physically superior ape is then stuffed into the armor, providing the soul with a body to control. That way you get the best of both worlds, ultimate strength of nature controlled by a "sane" human mind.