https://www.youtube.com/watch?v=f-PnEDS62vY&t=977s Many purple versions of the boss appear. Everyone needs to pick a quadrant and run through all the ghosts to reveal what color they are. After a little bit the boss will siphon from the two furthest crystals from her and show those two icons around her then teleport to middle. When you know what crystals she’s chosen you need to find a ghost of the color of the crystal she DIDN’T siphon. One person per ghost.
So, if she’s closest to the yellow crystal then she’ll siphon green and red and everyone will need to find a yellow ghost revealed from the “run through the purple people” phase.