... screw an encounter designed to kick my ass. If the adventure designers are going to put this type of total garbage into a module,...
The encounter reminded me of the Green Dragon in the Starter Set and the Blue Dragon here.
I don't understand what lesson the module designers are trying to "teach players", but it's total crap IMO. These impossible encounters (and this one would have been if not for the DM) just teach me to not buy WotC adventures in the future.
Instead of rat bastard DMs, we now have rat bastard adventure designers. Whatever. I'm playing the game to have fun, not to have a player humiliated by the power of the DM (and more specifically, by power of the module designer).
There's nothing wrong with difficult encounters, but ones designed to screw over players via the supreme power of high level monsters are just plain garbage. It's a fricking game.
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