The Lair of the Pirate King is a level 42 dungeon delve in Pirates' Skyhold. You can queue for this dungeon from levels 45-46. A Dungeon Delve located in Pirates' Skyhold near #9 (The Docks) on the map. Map Coordinates: (3406, 3195) (top right far corner)
You can queue for this to run it in a 5 man group, or you may enter manually solo or with any size group you desire.
Bosses of Lair of the Pirate King
The Redolent Surgeon
Just pull him 2 rooms before. This will delay adds and the fight will be easier.
OR - pull him to the ledge next to the bridge heading to the next campfire and then you can toss the adds.
Bosun Thickgristle
Try to fight him near the edge, you'll be able to toss the adds while the melees are killing the boss.
Bartholomew Blackdagger
Having 2 clerics makes the fight easier.
You will need to work well together as a team and burst dps the boss down before you are overwhelmed by the spawns
Just focus on the boss and avoid his AoE that heals him and deals high damage.
Optional safer way: All but 1 focus on the spawns and slowly kill the boss.
If you have a very skilled high recovery spec control wizard, they may be able to keep all the adds under control while the rest dps the boss.