The Endless Limbo

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Mammon resulted to be one of the Seven Princes of Hell, the Supreme Noble Archdemon of Greed, who reigns over the Layer of Greed, and constructed a land of wealth and treasures named the Pandemonium of Greed, where he resides with a billion other demons as his servants.

According to the Imps his story is rather pitiful.

During his time in Heaven, he was depicted as forever looking downward at Heaven's golden pavement rather than God himself. In fact, Mammon's obsession with gold was to the point where he did not even care about Lucifer's rebellion but due to the fact that he cared more about material wealth than God he was cast out by the archangel Gabriel.