The Gire of Sillipus 7th Sea RPG by Alderac Entertainment Group Heroes' quests often take them

Heroes' quests often take them from the deepest buried dungeons to the loftiest reaches of the world

Players are introduced to the city of Sigil - the Cage

The Navis Primer provides expanded rules for navigation and astrotelepathic communication

or can be used in an ongoing campaign

Trail of Cthulhu

The Gire of Sillipus 7th Sea RPG by Alderac Entertainment Group Heroes' quests often take themThis sourcebook sends the adventures on a trek through the dark side of Jorune, into contact with the Blue Legion powerful muadra with a thirst for power. Also includes a campaign setting with detailed NPCs, maps of key cities, new creatures, and new revelations about the pirate realm.