Some of the classes include the Battle Master, Devil Hunter, Arcana or the Berserker, each one offering a very distinct kind of gameplay.
Lost Ark is much more than a simple multiplayer hack and slash game this is a full-fledged MMORPG with a large world map to explore and plenty to do besides following the main story, which says that the game world is being invaded by demons, with random chaos gates that are used to cross and also work as open world events called World Class Crisis, where players have to fight together to defeat the invaders.