They are quite good and very imaginative, I have just one thing to point out and that would be that the humans arriving at the planet couldn't have been strong and agile and such, seems improbable that they could impress on mutated aliens, but instead they could have arrived there and having advanced technology that impressed the less technological Losarians. The human became accepted by the Losarians and eventually mixed their blood with the aliens and learned their fighting techniques and thus becoming the Elite Guard with humans strength in intelligence and the losarians strength in combat. Also would they be the ones that gave losarians the technology to travel through space and therefore being the main reason of the losarian invasion. How does that sound?