Purple Pi are found in areas with high concentrations of math. In fact, they may be growing on your math homework right now! They die when exposed to high concentrations of letters. Once a purple pi infects you, you must run to the nearest computer, laptop, smartphone, or tablet and type "The quick brown fox jumps over the lazy dog(e)(s)" for 4 hours then the purple pi's are dead. Near- or true Undefeatables infect purple pi, turning them into miniature versions of themselves.