Ogon no Oni

Ogon no Oni are also called Oni of Gold. They exist only to increase their wealth, and the original Ogon no Oni was summoned by a foolish Yasuki Merchant who believed the demon could help him get rich. To make sure the demon would not steal his treasures, the Yasuki bound it with strict rules. It had to obey any law to which it was bound, and it could only touch treasure it had been given. The oni accepted these rules, and made the Yasuki very rich, but in the end tricked the merchant into giving it all his treasure. Ogon no Oni fled into the shadowlands with its treasure and found a suitable nesting place. It was taught how to create spawn by the Oni Lord Tsuburu no Oni, and ever since began sending out it's spawn into Rokugan to search for treasure. (CoR3E p. 144)