We have wanted an excuse to expand on the spiked hills of set 5 for some time now, and in Old World Style set 15: Broken Lands we've expanded the coastlines, re-envisioned the mountains from other sets to combine them with the spikes of other worlds, created more calderas and volcanoes, lava, buttes and mesas...oh1 and we've thrown in some new valleys as well. great to use in combination with other old world style sets. We've also included transition pieces to connect with older sets and hope you enjoy using set 10 with other Old World Style sets! We've included tilesheets, making it easy to create in programs like Tiled (for tilesheets), or choose your own map editing program. With Tiled, you can save out whole or partial images as jpg or png format for quick insertion to your favorite VTT, or have your maps printed out for a tabletop adventure!