Tanya Grotter and the talkative sphinx 13

There are different kinds of sphinxes. Egyptian, Assyrian, Greek. But among them, only one loves to make magical deals. Once, in an ill-fated hour, when the undead almost took over Tibidokhs, it was to him that Drevnir promised the key... to the Horrifying Gates in exchange for victory. However, the sphinx promised a few hundred years of delay. And now they have passed... But not everything that you gave away once can be taken back. Gleb Beibarsov understands - having refused Tanya, he was hasty. However, now Vanka stands in his way. Gleb cannot deal with his opponent himself, so he chooses an unusual duel. But that does not make the duel any less dangerous, especially if a fragment of the old scythe of Aida Plakhovna is fixed on Beibarsov's bamboo cane..