"People also think it's strange that I'm the single most Evil entity in Ray's control - and believe me when I say I am very loyal to Master. I'm a Purity, technically, and I'm supposed to bring good health, infinite luck, and sweet dreams. Instead, I bring petislince, bad luck, and nightmares. So, cool, eh?"
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(for Ii species backstory,
http://www.freewebs.com/baals_baby/evilsandpurities.htm)