Ri Zho the Rat has a chance of dropping a money pouch. Within the pouch you can redeem anywhere from 1 to 5,000 gold. Break the suspicious jars and mysterious chests to get the items (torch, bomb, or flame bomb launcher) to ignite the barrels and trigger Ri Zho the Rat. Ri Zho is not a guarantee spawn. The best spawn rate is the northern building in the area with the hogs. Ri Zho can also be found in the cave systems. Best practice to do it when no one else is around as people may try to get the first hit. the respawn timer for Suspicious Jars are 14 minutes.
P.S. there are better ways to make money, this is just an optional method for something to do while you are in Beastbog.
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