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Not only gnomes live underground, but also other creatures. The most intelligent of them are Kobolds.
This peaceful race is technologically far behind the gnomes. They do not have advanced technologies and mechanisms, but they are excellent diggers. Kobolds are capable of building an entire city underground in a month, with dozens of streets and hundreds of buildings.
As soon as a Kobold reaches the age of 1 year, he enters service as a porter. Every day, he collects the rock that his older brothers mine in numerous adits. Then this rock is sorted, some is sent to build new houses, and some is used to make shovels, picks and other items.
Kobold Porters are very dedicated to their work and always take a responsible approach to their work. After all, if one of the kobolds shirks work, the entire production chain will be disrupted and the colony may suffer.