Answer:
A hole in a pole. Though I fill a hole in white I'm used more by the day and less by the night
The shorter I am the bigger I am.
I am a ship that can be made to ride the greatest waves. I am not built by objects, but built by minds. What am I?
I'm a ruler with 12 agents. Half of them work in the darkness. Who am I?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
What can you lose that will cause other people to lose theirs too?