Why you don't anger a prepping player.

So for context, a group of my friends are do a full gestalt game with homebrew. The setting is that we essentially iseekai'd ourselves into a 5e world of my friend's the DM. We had a system too like in an anime that pretty much every in that world has access to. So we go on some adventures, some of us died because fafo and changed races/classes. Long story short, the system for the rest of the world has shut down except for us and even we have limited access to the system too. So it's up to us the kill these 4 titans and restart the system for everyone. Background story done. So one of our party members, during our downtime, had the unpleasant chance of meeting one of the titans. They never said what pissed him of so much but he had a vendetta against it. Now fast forward to the present and this particular titan is attack a sect city and needs help. Now our vendetta player isn't someone who blindly tries to kill the titan he makes a plan. A plan that he has formulated long before this campaign. Now our DM had this intricate plan for us to fight this titan with a level 30 demigod by our side helping us. But he also wanted to give our vendetta friend a chance at revenge. So he had us roll d100s and averaged out the scores. So then with fate's random luck, our vendetta party member got a 67 sided die made of jade. He has to ability to cast glyph of warding. You can guess what sort of shenanigans he was up to. He had the level 30 demigod open up the titan and force the Jade die inside of the monster where it would go off. The monster was obliterated, as well as everything else in a 1 mile radius. The citizens were evacuated but we were warned both in game, and out of game that we were never to build another nuke like this every again.