It’s in the ogre room at the back. It spawns once you start damage phase. It’s a taken Minotaur. Kill it and take the orb it drops and deposit it in the statue on the wall to the left of where you first drop down. This will spawn a mini ogre also. Complete the encounter as per normal and then speak to the statue of Shuro Chi, you will then receive Wishender.

The invisible enemy is at the first bosd

Its in the ogre room. Kill invisible enemy that spawns out of that taken blight stuff on wall. He drops an orb that goes on the left wall somewhere. Then iirc, a second ogre appears. Kill em all. If you need a second round, you dont need to get invisable bro again.