Here's what I was able to make. Due to real life and school, I won't be able to finish it to my liking...
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The Nui-Phryno, an elongate reptilian-like rahi, has been, and still is an extremely elusive species. The race originated from a Makuta experiment. Attempting to transfer a Kraata's power into the armor of an already living being, the Nui-Phryno only attained a small amount of an individual Kraata's power. The Makuta especially tried to infuse illusion properties into the rahi, not only giving them limited illusion power, but the ruthless passion of a Rahkshi. This can explain how Matoran don't recognize the creatures for the danger it really is. The Phrynos' favorite illusion is that of friends or close ties to its victim, which it stalks for periods of time before striking. It is unknown how many have perished from these rejected experiments, or how many creatures may still be living amongst us.
Now I'm curious to see what Ary puts out. Good luck to everyone!