Of The Betweenlands'four stone types (Betweenstone, Cragrock, Limestone and Pitstone), only limestone has no Ruins(Betweenstone has Marsh ruins, Shrines, Tar pool dungeons, Underground oasis and Wight fortresses, Cragrock is Cragrock Tower and Idol Statue, Pitstone is Underground Ruins) although the Wight Fortress are important There are also some limestone building materials, but the main one is Betweenstone. I think the limestone blocks are the most beautiful, so could you consider adding a limestone ruin? (for example, a dungeon in a limestone cave? )