From Destiny 2 Wiki
|Bosses||Vilzii, Scorn Chieftain (Chieftain)|
Kingship Dock is a Lost Sector in Thieves' Landing.
After fast traveling to the Thieves Landing, summon a sparrow and go forward. Take left and you will notice a lost sector sign on the first building on the right. Go inside, take the elevator up, and head through the cave on the left and you will reach a Kingship Dock. Eliminate nearby Stalkers and Wraith coming down the stairs. Climb up and kill a few Lurkers and Raider. Vilzii, Scorn Chieftain will spawn on the platform at the end of the arena where the chest is located. He will summon a bunch of ads, so keep your distance, focus on blasting him with heavy artillery and he will soon be defeated.