Eleusinia in the Hive in Destiny 2: Forsaken.
A pit that has a Boss inside it.
Dul Incaru, the Eternal Return
Vorgeth, the Boundless Hunger
Keeper of Petitions
Shadow Thrall
Taken Goblin
Taken Vandal
Taken Captain
Taken Phalanx
The Descent(The Shattered Throne)