nice
yeah a lot of the best equipment in the game can be found on the black omen by charming the enemies and particularly zeal. also the wall panels, and a couple of the enemies give tabs.
and since you can actually do the black omen 3 times if you do it in the right order you can rack up quite a few tabs, gold studs for everyone and also a total of 3 prism helms and 3 prism dresses. so if you choose to also get 3 prism helms from melchior, then everyone except magus can have one (which works bc magus best helmet thats hidden in ozzies fort is actually better than the prism helmet) and all the girls can have prism dresses. maybe you already knew that lol
and also you dont have to fight lavos through the black omen, you can take a gate out and leave