It's at this stage that really difficult bugs are tackled. The only occurred onces, the unable to reproduces. Oh, when you talked to Jaroo he didn't have any idea that you successfully completed the quest he gave you? Didn't that work yesterday? Well, what changed? Nothing. Let me try it over here. Works fine. Okay, you try it again. Works fine. After a couple of hours of prying and guesswork, it turns out it only happens if the follower Elmo is the first character in the party. Temple of Elemental Evil is a big game, with tons of locations, quests, dialogs, followers, spells, magic items to find or create, class abilities, feats, monster abilities, interfaces, races and domain abilities. Dungeons and Dragons is a complicated rules system with tons of nooks and crannies to keep things interesting. The story is very non-linear, with lots of different ways to accomplish lots of different goals. In short, it's a testing challenge. Once, I got a bug with familiars. Familiars are crashing the game, said the testers. Works on my machine, I said. Turns out it was just the weasel; it had bad art. I never used the weasel; I preferred toads.​