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Ptolus is not a Flat city, but very Vertical.

If you’ve got full access to this website (request here) then you can see the Vertical Ptolus entry from the Secret’s of the Delver’s Guild supplement.

The City by the Spire has lots of varryation in elevation throughout the entire urban area, not just the defined “steps” for each District.

This is easy to forget since the Ptolus Map overview doesn’t show any kind of topographical information.

Checkout Broken Leg Row in Midtown nearly to the cliffs of Oldtown. This road is so steep and dangerous it was named for all the broken bones that happen on it.

Add in the constant raininess of Ptolus weather and you can quickly determine how just traveling the City by the Spire can be dangerous!