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Awesome, thanks! The summary catches the most important parts, but I'll check the rest out; will probably have to get back to this later in the week (or next week), but now I know where to look.
I'll have to go digging, but I vaguely remember the Caverns of the Necromancers promo for Return to the Tomb of Horrors having something Orcus-ish in it. Won't be able to check until the weekend, though.
I don't know if this helps but the entire bloodstone series of battlesystem delve into Orcus and his awesomeness. I'm currently building up to bloodstone pass for my group and I'm running a necromancer that was driven insane by saying Orcus over and over again in an attempt to call him. Only he did finally get his attention.
Ok, here is what I came up with. It's a bit on the longish side, so I may trim it to just the essentials that define the relationship between Orcus and Acererak (which is not much), and/or move a lot of it to Acererak's article. As is, it is longer than the descriptions than all the other characters, and a lot of them were significantly more involved in serving Orcus.
Is anything missing from that bit, or would you say it is fairly well covered?