The ultimate limit on how fast you may go

The sun has dipped, yet light remains, a soft farewell in golden veins. Not dark, not bright, I softly stay, the closing breath of a fading day.

My purpose in this world is to prevent murder using fear tactics. Day and sleepless night I keep unwavering, unseeing watch. I don't move a muscle nor do I say anything even if I do see something - I simply let my daunting form do the speaking. This is a good thing, though, because if I could move, I would frighten more than just my intended audience.

Which side of a chicken has more feathers?

A mount you cannot sit bestride unless triple blest by chance, choice and purity. Its namesake spelled in plainest terms is first of singularity, second of a golden grain fruit whose abundance could drive droves to insanity.