This is a new cave area with a champ spawn at the end of the area. You will have to go through the cavern to get into the champion area. The entrance to this cavern is in a mountain in the High Plains region in Ter Mur (east of Fisherman's Reach). You cannot mark, gate, use bracelets of binding to get into this area. There is a slight puzzle to figure out to get to the champion area.
More information will be added this week sometime.