Moon Tree (月の樹) is a guild of pacifists, promoting harmony and peace in The World R:2. It is composed of around 1,000 members who are devoted to restoring The World R:2 from its corrupt, PK-ridden state to the prominent The World of the past. Moon Tree is the greatest opposing force to Kestrel. Members are generally forbidden to PK or PKK unless they themselves are attacked, or if they are fighting in the Arena.