Fuller Than Death

In the grand circle of life
Most march to the day's fife
But some break out into the night
Here are spirits that are made to fight
Chosen by creation to clean the land
Benevolent violence dealt by their hand
They come from the winds blowing stark
Immaculate incarnate of the dark
They bear the black shadows steel
Bearer of umbra and to it they kneel
They can never truly die and fall
For they must answer creations call
To hunt those who are not of this plane
Spill blood from otherworldly veins
Their dark blades steal many a final breath
Aberrant horrors dealt an icy and dark death
No mortal tongue knows their name
For they are the dark outside the flame