Coronaster

i am the king of the death,
I catch hold of people's breadth,
Can anyone stop me,
Even if I Rome the world free,
I can jump in air and swim in water,
No one will be able to catch my collar,
I'm one of death and friend of soul,
I'll even go through lungs and sit in airhole,
No tax, no payments, roaming with ease,
I came from Chinese,
And spread through cold breeze,
My ancestors are not strong as me,
But look at me,
I am the death's key,
And once again remember,
I am  death's key!