I played it once, a long time ago, and was (before I even knew what munchkinning was) the worst kind of munchkin.
The DM said we could start with level 10 characters, which was cool, since throwing stones at kobolds for six months sounded really boring. I designed a Bard who was basically 100% optimized for Charisma and Bluff.
The campaign involved some attempt to get some artifact. I told the person trying to keep the artifact from us that we were the rightful owner, and made my bluff check, so they told me where it was. The artifact was guarded by some guards, but I told them all we were authorized to enter their super-secret area, and made my bluff check, so they waved us through. Inside there was some labyrinth of tunnels or sewers or something, with some kind of (sapient) monster guarding the artifact. The monster was just totally unwilling to let anyone through, and was clearly stronger than we were.
So I told it I was the Tarrasque.
It was…dubious. My character was this wispy, incredibly attractive woman (remember, I’m optimizing for Charisma at the expense of everything else) who didn’t even look like she could open a can, let alone be a Tarrasque. Also, we were were in a cramped tunnel system.
It asked me if I was sure. I said I was…and made my Bluff check.
The monster ran away in terror, everyone was really angry at me, and I haven’t played any D&D since then. RIP Kahe Kalirion, you deserved a longer and more storied legend.