Atlantis climbs the steep and singular feature just right of Thin Ice.
P1: Begin by climbing the overhanging right-facing flake just right of Thin Ice. Strenuous but straight-forward. 5.10c.
P2: Climb up flakes to briefly join Thin Ice, but then traverse right on more flakes to a bolted belay. 5.10.
P3: Step right to the tips crack, get a couple pieces in as high as possible (purple TCU, wires), take a deep breath and punch it on really powerful tips liebacks to an obvious incut slot. Shake, place more pro, and continue up on slightly easier terrain (including a beautiful hand crack). Belay on a ledge. 5.11c.
P4: Climb out left from the belay through a small, tricky bulge/roof, then continue up the corner system to the summit. 5.11a. It is also possible (and recommended!) to do the spectacular Lost at Sea flake which departs from the right end of the belay ledge (but unless you climb 5.12+ slab you'll have to rap back down and climb the standard P4 to top out anyway).
Descend to the north; see the description for the Sorcerer for more details.
Protection
Single set of cams from tiny to #2 Camalot. Wires.
By Mike From: Phoenix Nov 14, 2007 rating: 5.11c PG13
I recommend doing the Lost at Sea finish. After arriving at the Lost At Sea anchor one can rappel down and left to arrive back at the belay, then finish on the last pitch of Atlantis.
A good link-up is Thin Ice to Atlantis to Lost at Sea to Atlantis.