Crashing Graz'zt's Party, and then Crashing the Multiverse

The Chatty DM reports no the end of his latest (and potentially last) D&D 3.5 campaign:

The game went exceedingly well, better than I had hoped.The players were clever enough to navigate the minefield that was a hall full of Demon Lord avatars and ambassadors and live!

It went so well that we actually managed to end the campaign, maybe not as dramatically as I would hope, but it was satisfying to have closure.

As you'd expect, he finishes up with a brief list of lessons learned.