The letter “d” it is
Feathers I have sixteen, but I am not a goose. If I lose any of them, then I am of no use. I'm always shot but I'm not a bird. What am I?
I give light by night, but not by day, Am wicked but not evil in any way, Wax for the most but always wane, Except when I'm out, I stay the same. What am I?