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Swamp of decomposition

Decaying everglade

Putrid atmosphere

Contaminated morass

Dissolution of rancid remains

Engulfed by cadaveric fungus

Reeking glop of miasmal pus

Wasting away in the muck

Malodorous sludge

Immersed in the slime

Rotting mephitic mucus

Ooze of putrefaction

Submerged into vile repugnance

...of the bog