The bundle deal gets its name because it only features top-selling indie D&D supplements. These titles have all made the Platinum best-sellers rank at DriveThruRPG.
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Jeff Steven's book of short adventures for D&D's 5th setting is compatible with the basic rules and creatures but also Kobold Press' Tome of Beasts and Creature Codex.
Saltmarsh Encounters is a platinum best-seller at the DM's Guild.