Strong Elite Monsters, also known as bosses, monsters are alot stronger than any other type and require a party of playes of the same level or higher to defeat them.
They can be found in dungeons or outdoors and always have titles over their names. Unlike common monsters , these have a guaranteed chance to drop equipment and improved loot if the players empty their Break Point bar.
Outdoor monsters are usually passive, that is, won't attack unless attacked. There isn't a quest related to any of them so far, but they do award achievements. Their locations can be found here: Boss Locations
Dungeon monsters attack any player who's near them and usually have one or more quests related to them.