In addition to their usual business as a trading coster, around 1372 DR the Claunkrar Coster was establishing and expanding a network of portals for transporting individuals and small, high-value items quickly between important sites in Faerûn. The codename for this network was the "Crawling Treasure". Typically, they would acquire a property in a town they did business with, and then set up a portal in an interior room or cellar where comings and goings would not be observed. They also chose vantage points near trade routes and cities that could be used to spy on the competition or make it look like they traveled the whole road rather than appear out of nowhere. The more important sites were protected by hired guards. Around this time, they were also hiring adventurers, bandits, and even intelligent creatures, (especially shapechangers) for reasons unknown, and becoming ever more secretive about the Crawling Treasure.
The Spellplague hit this region in the Year of Blue Fire, 1385 DR, with devastating results. It is unknown if the Claunkrar Coster, or even Rethmar, survived, or if any part of the Crawling Treasure continued to operate after the disaster that created the Underchasm and the Shaar Desolation.