You have entered the ruins of Myth Drannor and survived to tell the tale. While this is still considered a holy place for elves across Faerûn, others may be keenly interested in hearing of your exploits. When you stay at a tavern in a large city (such as the Yawning Portal in Waterdeep), you may make a DC 18 Charisma (Persuasion) check; if successful your drinks and lodging are paid for by the other patrons.
If unsuccessful, you are stuck with the bar tab for everyone that night.
In dealing with powerful or high-ranking elves, you roll with advantage for persuasion checks due to your daring deeds within the ruined elven city.
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