Nothing and Nothing

I have nothing,
But a pen,
A mighty weapon,
For a conqueror.

I have nothing,
But a paper,
A defensive shell,
In a real battle.

I have nothing,
But an ink, Perfect evidence,
For prevailing the truth.

I have nothing,
But a book,
A magical key,
For the life-door.

I have nothing,
But for me,
A pointless soul,
Living in an illusive cage.

I have nothing,
And nothing,
Truly nothing,
It's better to be nothing.