Everyone Goes All-Out
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"GRAAAHHH!"
Mammon kept screaming, in both of the pain Blake's spear inflicted on him, and also on the pain of his overloaded power, which was already making the mad demon grow even madder.
Yet his powers only continued growing and blossoming in strange ways, although his aberrant physical body was bleeding and dying, his wings, of rainbow color and made entirely out of spiritual energy, continued growing.
To the point they started growing large rainbow-colored eyes, looking at the entire world around him, and beginning to quickly charge energies.
"Is he going to destroy the entire city?!"
Elizabeth panicked, noticing that the wings and the eyes attached to them were so large they could easily destroy the entire city with just two beams.
It was indeed as Mammon said, if he can't have it, then nobody else can.
He'll destroy anything that he can't have, that was how the Archdemon of Greed worked.