So the challenge is everyone must kill only one Oracle in the Oracle phase.
This isn't too hard to grasp my friend. You build the portal like you always would, and the Relic dude stands in the area where you kill the Oracles. The 3 building the plate jump in, and back out for Damage phase.
Simplified even more for your convenience!
1. Atheon teles 3 guys
2. Kill 3 Oracles inside the portal. One per person.
3. Build portal.
4. 2 in portal come back to main room to keep portal open. Relic guy stays behind just in case
5. Portal team rushes into portal to kill Oracles
6. Damage Phase
"Hardest challenge yet in Destiny"
B.S. Unless the timer is strict, there's nothing really to this challenge. I think Oryx Challenge is still harder.
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It's the supplicants that make it difficult. If you're doing it right, almost everyone is in and in the portal before the supplicants fully spawn and surround you, so when everyone is leaving the portal they begin to explode on the first few and kill the last. The amount of wipes I've had by group members not able to avoid them is ridiculous.