An adventure for character levels 14-15

Remember the good old days, when adventures were underground, NPCs were there to be killed, and the finale of every dungeon was the dragon on the 20th level? Those days are back. Dungeon Crawl Classics don't waste your time with long-winded speeches, weird campaign settings, or NPCs who aren't meant to be killed. Each adventure is 100% good, solid dungeon crawl, with the monsters you know, the traps you fear, and the secret doors you know are there somewhere.

Legend tells of a long-dead empire of sphinxes, ruled over for millennia by a great queen named Ankharet. She fell into darkness and her empire was shattered, as her subjects rebelled and cast her down. Unable to kill her, it is said that they bound her with great magic and buried her in a tomb, to wait for the foretold heroes who would be able to slay her and end her evil forever. Their empire in ashes, the sphinxes scattered to roam the world in bitter freedom, save a single great androsphinx.

On the edge of the mysterious Barren Hills, between the mountains and the Great Desert, there is a gigantic statue of a crowned gynosphinx, ancient beyond reckoning. At its feet, a great androsphinx known as Khubsheth the Prophet has dispensed counsel and prophecy to all who come to him for longer than mortal records can tell. The heroes have come to visit Khubsheth, whether for counsel, prophecy or out of curiosity, but as soon as he lays eyes on them, he attacks! Upon his defeat, he tells them that they are the heroes foretold by the legend of Ankharet. Ankharet ruled over a long-dead empire of sphinxes, but she fell into darkness. Her subjects rebelled and cast her down, but were unable to kill her. It is said that they bound her with great magic and buried her in a tomb, to wait for the foretold heroes who would be able to slay her and end her evil forever. Kubsheth the Prophet tells the heroes that they must enter the tomb of the long-dead sphinx queen, kill her, and destroy her cursed crown, an artifact of tremendously evil power. As his blood seeps into the sands, a doorway opens at the base of the statue, leading down into darkness...