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There are tunnels and passages that lead deep under the land to the ever-dark homes of the various so-called “deep races”. These descents are typically marked on the rare maps of these underlands as either primary, secondary or tertiary passages.

These passages lead on for miles and thus only their general routing is typically mapped, but of course, the underdark is not a place you wander expecting to never encounter anything or anyone. Thus we have sample sections of these passages mapped out to provide more detail when running into drow or sverfneblin patrols

Sample Primary Passages

Sample Primary Passages

Here are five sample stretches of Primary Passages – these passages generally have fairly even flooring, with ceiling heights of 20 to 50 feet (averaging at around 35 feet) and widths generally of 30 to 40 feet. Some portions of these passages are worked to make travel easier, but they are mostly natural and generally fairly straight.

The original Descent into the Depths of the Earth was published 40 years ago and included one sample stretch of each of the three sizes of passages. The original primary passage example has been reproduced here (the second from the right), with four more drawn to add variety to the encounter options.

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