"Scheming, cowardly, disgusting creatures who exist only to satisfy their own impulsivity. Were it not for the Hobgoblins keeping them as workers, I estimate they would overrun entire villages. They are native to the northern lands of Ozel, preferring dense forests and bogs to open plains as it affords them ample places to hide. Due to their curiosity often getting the better of them, a Goblin often has a short life span. However, after roughly thirty years, they undergo what could be best described as a "second maturity." Their skin goes from their normal greenish blue to a more brown or auburn color, and their muscles increase in mass. This, naturally, comes with a proportional increase in ego, which is why many Goblins are found in the service of a collective of Hobgoblins."
-Excerpt from Volo's Guide to Ozelan Beasts