FALLEEN (from Star Wars Encyclopedia):
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Inhabited by a humanoid species also called Falleen, it was the homeworld of Prince Xizor, 
long-feared head of the underworld syndicate Black Sun.  The Falleen are reptilian in 
ancestry, with scales, cold blood, and skin that can change color according to their mood.  
A Falleen's lung capacity is great, and they are able to stay underwater for up to twelve 
hours.  Coolly calculating beings, the Falleen are considered among the most beautiful of 
all humanoid races.  In addition, both males and females have enhanced hormones, 
exuding a pheromone that makes them practically irresistible to the opposite sex.  During 
sexual arousal, a Falleen's color changes from grayish green to warmer reddish hues.  
Meditation and exercises bring the hormonal essences into full bloom.

Ten years before the Battle of Endor, Darth Vader established a biological warfare laboratory 
on Falleen in an area ruled by Xizor's father.  It was the Dark Lord's pet project.  But a 
terrible accident occurred at the supposedly secure facility:  A mutant tissue-destroying 
bacterium escaped quarantine.  In order to save the planet's population from a horrible 
rotting, always-fatal infection for which there was no cure--and to minimize Vader's 
embarassment--the city around the lab was sterilized.  It was burned to the ground in an 
orbital bombardment, killing 200,000 Falleen, including Xizor's family.  Xizor, head of the 
Black Sun organization and, at one time, possibly the third most powerful man in the galaxy 
after the Emperor and Vader, vowed vengeance on the Dark Lord. [soe, soesb]