How to Make D&D's "most powerful character. EVER."

Let us make the legendary Pun-Pun, an all-powerful D&D character build in the 3rd edition of the game, and examine the effects that his legacy has had on the game as we know it today.

Khan-the-destroyer's original thread, including the level 1 build, courtesy of the Internet Archive Wayback Machine:
web.archive.org/web/20130910235556/http://commu…

While I was away, I wrote an adventure! "The Heist at Nimressa," a 6-8 hour adventure for 3rd or 4th level characters and a silver best seller on the Dungeon Masters Guild!
dmsguild.com/product/257267/The-Heist-at-Nimres…

"While travelling the open road, the party encounters two good-hearted thieves with a potentially lucrative proposition: The despotic baroness Ytrix hoards a large treasure nearby, locked within her army’s fort. Wouldn’t it be exactly what she deserves to have that treasure stolen and given to the needy that she’s so long ignored and oppressed? That’s what the party’s new companions think anyway, and they certainly have no ulterior motive for the job..."