The five-star class big boss still wasn't considered a living creature, it seems XP monsters were completely filtered out.
Thinking so, Chu You picked up the only piece of Master-level gear, a Summoner class weapon.
Commandment Magic Book of the Toad Queen: Magic Attack Power +4247, Magic Critical Hit +50, Magic Lethal Strike +24%, PVP Magic Attack Power +20%, PVP Magic Defense Power +20%, Magic Hit +321, Vitality +1581, Magic Power +841, Magic Resistance +47, Pet Attack Power +20%, Pet Defense Power +20%, Pet Vitality +20%, Pet Magic Power +20%, Pet Attack Speed +10%.