To make it simple, after reaching round 60 on tier 2 cursed in Astra go to the speed cola room and locate the 4 chandeliers hanging in each corner of the room. Now you need to pick a single code and stick with it. It doesn't matter what side you start on, just make sure you are staying with that same combination. At the start of each round use your kazmir / aether shroud to distract the zombies / oscar ( not necessary for the relic, just for safety) and flop with phd under each chandalier, repeating that code once each round until you hear a clear mr peeks laugh. The portal is located next to the rampage inducer at spawn. Ive tried every other method available online right now and each run had me near round 100 with no success, however once I stuck to the strat I mentioned above – I unlocked it on round 65.
Once you are in the portal I recommend having a disciple injection, and use the trap in the center of the map to deal with the HVTs. Save the injection for the last wave and make sure to pop it while standing in the active trap.
Other important things to note: The akita at high rounds will crash your game so be very careful with it, and if you save and quit after round 60 you will wreck your ability to progress the relic. 5 / 5 times I tested it my candles never lit back up after resuming my save file.
Included below is proof of completion:
https://imgur.com/a/85wQPH6
Hope this helps prevent someone the frustration I felt having to repeat this relic multiple times purely attempting to activate it. Good luck everyone!