"What do you mean the vault is empty?!"
"Just that, sir. It's empty."
"There was a half tonne of gold coins in there! Did you see a cart? Any orcs or ogres? A dragon?! It's not like it just got up and walked away!"
An insignficant little species, the candlebug (or waxmoth) is a persistent bane for mages and merchants alike. Each the size of a small digit, these little scarabs thrive on wax and burrow up inside candles, ruining them. Sometimes a late-night worker will hear a crack and a sizzle as his candle expires, only to find the half-burned remains of a waxmoth squirming around on his desk. This is very annoying in worlds where candles are expensive...