From publisher blurb:
Sinister Secrets for Epic Greek Adventure
The 40-page Mother of Monsters GM's Guide brings you a wealth of insider information on the epic adventure opportunities to be found in the Kagari Isles. You'll find lore about the hidden history of these lands and seas, from the Age of the Titans to the Age of Despair and the current Children of Maigara. You'll likewise find and expansive gazetteer of the people and places of the archipelago, with beautiful maps, fiendish factions and organizations, and so much more! Plus, you'll find new DnD 5E bonus material ijn this book too, like:
New magic items like the shield of reflection and amulet of the tabiski.
Ready-to-use NPC stat blocks like the amazon archer and naga-folk warlock.
Sinister new monsters like the faelori giant and the unique laesuri - the "Dread Ones" like Onazoka, the Crawling Hunger and Ehura Sutara, the Slithering Darkness!