ShadoPrism:
Definitely a once in a life time roll.
And that is why that GM sucks. You guys witnessed something that perhaps no other person on earth has ever or will ever witness again and stole that moment away from you.
I am reminded of a story from my college D&D days. The party was ~7th level or something like that and ran afoul of an adult black dragon (CR waaay too high). This was a cinematic moment where the party is introduced to Big Bad early on, runs away etc. So the party is running away and the wizard has expeditious retreat so he can keep up with the party and still shoot spells over his shoulder. He had time for a single spell and just for fun, he threw a phantasmal killer at the dragon.
Now for those that don't know, Phantasmal Killer is a spell that can potentially cause someone to die of fright but only if they fail about a bazillion saves. First the wizard had to beat the dragon's spell resistance. Passed it with a 19 or 20... Then the dragon had to pass it's next save. Anything but a '1' would do it. GM rolls a 1 right out in the open. Okay...the dragon is scared but there's no way it could fail it's heart attack save and.... another '1'.
Dragon has a heart attack and the fleeing party hears an earth shattering "whump" from behind them.
This was the GM's Big Bad and his whole campaign was derailed when it died but you know what, like a hydra three more campaign opportunities sprung up from that corpse. The next session was just the party inventorying, identifying, and dividing up all the magic items. Then the next session was a big plannning session on how the hell they would cart back mountains of gold and gems without anyone realizing what had happened. Then came the shopping spree...
Basically while the GM lost his plans he was able to give the players a truly amazing story and ended up with over a month to replan his adventure. As for power levels I think he just treated the party as a level or two higher due to the sheer amount of magic and gold the players had. Now you have a dragon's hoard but how do you guard it? Who else is going to come looking after it? The GM didn't have to scrap ALL his plans but a bit of allowance for the story to surprise HIM gave everyone involved a memorable story to keep with them for their entire life.
How
dare that GM rob you of an epic story just because he wasn't happy with how lucky you rolled.