A sleek, light-boned Aerost with slate-grey and midnight-blue plumage, Kestrel appears built for the narrow spaces between branches rather than for open ground. His feathers lie close to his body like overlapping blades of weathered silk, except around his left shoulder, where a ragged patch grows in crooked after an old fire. Hawk-like eyes constantly track distant movement, and the faint pale rings around his pupils make his stare seem almost luminous at dawn. He moves with a measured stillness until action is required, then becomes a sudden blur of folded wings, hooked boots, and snapping blue-black feathers. His weather-resistant feathered cloak smells faintly of cedar smoke and rain. The contradictory impression he leaves is that of something both fragile and immovable, a narrow-boned figure who can perch on a reed but seems capable of standing against a storm.