From Destiny 2 Wiki
|Bosses||Alkestis, Sacrificial Mind (Minotaur)|
Note: Champions spawn only in Legend and Master Lost Sectors.Hydra and a bunch of Harpies down below. Defeat them and proceed forward, at which point a Minotaur will appear. Overload Minotaur also awaits in the next room, with a dozen of adds. After you kill it, take a right turn and go up the spiral staircase. Here, you will be attacked by Goblins, Fanatics, and another miniboss. Two Wyverns will soon spawn. The wave will end with 2 Barrier Hobgoblins, after which the path forward will be unlocked, leading to Alkestis, Sacrificial Mind.