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Start low and slightly right on the face on good edges. Utilize a 2 finger niche up higher and nice sharp "ear" crimps for a delicate topout.

Towards the end of the Royal Arch trail, before you cross the rocky ridge, a bit under the 4th Flatiron. Find the Sentinel Pass sign saying "You are at Sentinel Pass". Follow up the north side of the ridgeline uphill for another 5-10 minutes.~ 40 yards off the north side of the ridgeline you will see a nice boulder.

The rock on this route might be a bit fragile. The landing has a medium-sized rock right where your head would land. Don't plan on falling unless you have pads.