I defeated Bonemass not long ago and I knew that many new Raids were going to start and soon I got most of them at my home base. Wiki only listed 2 Raids in the Mountains, Cold Wind From The North and You Are Being Hunted. Was way up in the mountains when I got Skeleton Surprise Raid, but Wiki did not list it for the mountains. Was Skeleton Surprise Raid added to the mountains in a recent update? I survived the raid, I had just crafted a stone cutter table and repaired an old stone tower at the top of the mountain for my portal.