Whistle

“Useless spirit!” I cursed him, drew my sword, and leapt into the air.
I drew the whistle I used to coordinate the movements of my lord’s Guard and started piping on it as hard as I could. It would be useless to alert any of the humans, since their ears were just too stupid to hear it, but any of my people would, and would come flying.


Heroic Hearts, Little Things, Page 7