Passage width
Normal: 10ft. wide 10ft. high
Iron bars block the tunnel and debris covers the lower half. If PCs dig it out they discover a rusted, bent bar that allows passage.
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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