Now I'm intrigued. I never ran into anything that was DC99. I must have missed that particular thing... Anybody want to spoiler tag it and tell me what I missed?
It’s one time and really really late in the game. It doesn’t matter, as the post indicates. Going by Larian’s critical success rules, you still have a 5% chance of succeeding. With 4 rolls, an 18% chance of success. With advantage on every roll and 4 rolls, a 1 in 3 chance.