Kobolds were like dogs standing on two legs, a little smaller than humans. They were about as strong as humans, or perhaps slightly weaker. However, they were very agile, more intelligent than Goblins and adept in group battles.
They were Rank 2 on average, and the higher-rank ones had race titles like Kobold Chief, Kobold Geronimo, Kobold Mage and Kobold King.
The apprentices were fighting thirty normal Kobolds armed with daggers and bows, four* Rank 3 Kobold Chiefs who were a little larger and armed with swords and spears, as well as a single Rank 4 Kobold Mage wielding a staff.