How to very easily complete Possessed Beyond Boss challenge (no scarabs)

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Proc Mysterious Invaders on an open map. I used Shore. This guarantees a beyond boss spawn somewhere in the map.

1) Pack a few Ending The Torment prophecies in your inventory.

2) Go easy on the map clear and just locate the Beyond boss. When you find it, activate an Ending The Torment from your inventory and go find a rare mob.

3) Drag the rare mob over to the Beyond boss and kill it. A ghost will pop out (Ending The Torment) so easy on the DPS, you don't want to kill or freeze the ghost.

4) The ghost should move straight over to the Beyond boss and possess it.

5) If you screw up and kill the ghost, just go find another rare. You can proc Ending The Torment in the same map as many times as you want, as long as there are enough rares.

I completed this in 10 minutes at a total cost of 2c. YMMV but this should be way easier than using Torment scarabs. Good luck!