Passage width

Tiny: 5ft wide, 3ft high. (Medium creatures have to crawl, difficult terrain)

The tunnel is clogged with sludge, muck and slime, making the surface slippery and dangerous. (difficult terrain)

Medium: The water in this tunnel is knee to waist high (Difficult Terrain, Slippery)

Undead: Escaped experiments from the Red Tower, many undead find their way into the city sewer. Zombies, skeletons or ghouls are common.

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