All this hullabaloo over the new announcement and cover have got me thinking...and while demons aplenty have played their part, several succubi and night hags, Grazzt showed up a couple of times running through the Lost Caverns of Tsojcanth...and I know I used Orcus for something long long time ago...
I don't recall...I don't think I've ever actually pit Demogorgon against a group before...either as actually face-to-face bruhaha or as a mastermind/behind the scenes guy. (DG never struck me as the plotting/scheming kind. More the "I step on you and suck your soul out from between my gnarly toes" kind.)
Yeah. In 30+ years. [Asmodeus either, but we're not talking devils here.] So, cool! B) I'll look forward to the release and potentially using him, finally, in a run of a 5e game...eventually...when I can finally get one going.