Nenio Riddles - Nameless Ruins

[Dao of Yakitori]

1- I am the Void and the emptiness. I am the starting point. I am infinite.
2- I am the impetus to act. I am a reason for torture, and a cause for insomnia.
3- I am the unknown. I scare cowards, but reveal my secrets to the brave.
4- I am the end of the road. I am superiority. I am loneliness.

Answers, anyone?