Passage width
Small: 5 ft. wide, 5 ft. High (Medium creatures have disadvantage on attack rolls)
The Big Flush. A torrent of sewage flushes through this part of the sewers.
Medium: The water in this tunnel is knee to waist high (Difficult Terrain, Slippery)
Swarm: A swarm of rats, beatles, bats or other such filthy creatures is infesting the area.
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