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Pro Real-world and D&D pantheon references
On Hallowed Ground details the gods of 20 pantheons, half of which are historical.
Pro Divine interaction
Several chapters are dedicated to exploring the potential interests, intrigues, machinations and mortal interactions of divine powers.
Con Missing some pantheons covered elsewhere
Notably, Deities & Demigods (1st Ed.) presents every historical pantheon in this book, plus American Indian, Arthurian, and Central American.