I thought of a new category of monster in game, known as Champion Monster. A Champion Monster is denoted by a purple emblem with 4 marks, with the description "Champion monsters are much stronger than you. A group is needed to defeat them." Champion monsters include multiplayer dungeon bosses, sky tower bosses, and other bosses that are too tough to take on alone. Champion monsters have the permanent buff Champion Immunity "Immune to stunning and movement impairing effects". Unlike boss monsters, which gain temporary immunity to stuns and immobilizations, champion monsters are completely immune to that, even immune to slowdown.