Kaernor's Smile is a large chasm on Tilnes. Minerals within the walls of the chasm drain power from ships attempting to fly through it, sending them plunging to the bottom. The crevasse is nearly 40 kilometers long, almost 2 kilometers wide at the middle, and over a kilometer deep.

The Smile is considered tainted and unclean, with nothing seemingly growing there. According to local legends, anybody who sleeps near Kaernor's Smile would have the same dream of battles and violence, led by two mysterious dark figures who suddenly identify the watching dreamer and redirect their armies against him. The dreamer then has a traumatic awakening. However, some believe that this nightmare is caused just by the cultural effect of the tale.

It was named for Kaernor Belasstie, one of the miners who disappeared inside it.