Though the book of Obadiah lays out the specifics of Edom's evil actions, Edom is not alone the only guilty nation. Edom serves as an image for how God will bring down all arrogant and violent nations.
Through Obadiah, God declared judgment over Edom and prophesied their erasure from history. Babylon overtook Edom 100 years after Obadiah, and they never recovered.