The Brotherhood of the Griffon is a 5e adventure for 7th-8th level characters that is set in the nation of Thesk, in the Forgotten Realms. The party heads to Phsant, where the characters get the chance to investigate the Brotherhood of the Griffon whereabouts, more specifically their leader, Aoth Fezim.
It's composed of three main chapters:
Exploring Phsant
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