I can confirm it works at 80. I got the drop on 8/1/10, and damn is it fun to play with lol.
Make sure to get your medal on your way out.
I WANT ONE!
What's an Octave Club?
Camped this bastard - went 1/7-8 idk.
Great for RNG relic trials - saving me about 3-4M in bullets. With red curry bun I can oclub TP > Slug Shot > oclub TP > Coronach.
Also, I can confirm it works at 80.
OClub DRK will easily be worth leaving it at 96. Unlike problems at 72, you'll have full haste gear available at 96. I don't really see a way for them to change this and make OClub96 worse than anything besides Kraken99. A few lvls of level correction/accuracy loss really shouldn't even matter that much, unless there's some insanely steep curve for mob evasion, which seems quite unlikely.