Haunted Monastery in Poisoned Marsh

A haunted monastery deep in a poisoned marsh, endless gothic arches disappearing into green swamp mist, wet stone floors reflecting a murky sick green light, hanging chains, ruined altars, stagnant water, roots breaking through marble, decayed statues, faint toxic glow in the distance, claustrophobic nightmare atmosphere, brutal supernatural horror, cinematic composition, hyper detailed, realistic, ominous, 8k