Rainbow Bird is a unique monster that gives 3,000 XP when defeated, which is the most XP that can be received from a unique monster. It can be found on the road to Rouge from Queen Fury and seldom on the road between Death Frontier and Ulara.
The Rainbow Bird is difficult to kill as it has a high chance of running away. It is weak against Confusion and can attack itself for 1 pt. of damage when it is confused. Using a Sachet is the best way to win this fight. Other options are using Panic Bell, Miranda's Bemusing Arrow and/or Dart's Mind Crush. It has a rare chance to drop the Rainbow Dress.