Blade & Soul's newest endgame dungeon release is called The Spiral Labyrinth, and Steparu has posted an extensive look at the content complete with multiple videos.
The dungeon features three floors, each of which ends in a boss fight, and there's a bit of randomization in the mix, too. Each time your party enters a particular room, you'll need to fight a miniboss. Defeating him triggers a random door which leads deeper into the dungeon level and eventually to the floor boss.
With a new dungeon comes new drops and new equipment. Steparu says that farming The Spiral Labyrinth will likely be necessary to compete in the game's upcoming PvP content. Have a look at the dungeon's first minotaur boss after the break, then head to the source link for several more gameplay videos and analysis.