How to begin quest: Talk to Rolith at Noobshire. This is the last free quest on his list. You must have already completed the Not a Noob quest. Requirements: 1 Rat Leader Reward: 100 gold, 100 xp, 1 Recommendation letter
What to do: In the areas of Noobshire, you will see a frantically shaking rat. Running to it will give you a chance to catch it and add a Rat Leader to your temporary inventory. Most of the time, the rat king will run away, but eventually you'll catch up. Return to the rat king to Rolith and collect your rewards. It is however unclear what the purpose of the Recommendation letter is.