This line is a steep slab with a small rib between bolts 1 and 2. It is between Drefach Lambda and Unknown 1(aka Black Bart). The crux is the slippery, thin slab around bolts 1-3. Once on the small shelf mid-climb, join either of the routes mentioned above to get to the anchors that these three routes share.
It is on the section of Atlantis Dome that is closest to the road, just above the big boulder that the trail hikes up to.
4 bolts, merges with Drefach Lambda or Black Bart (aka Unknown 1) for another 3-4 bolts to the anchors.