Bretself the Translator tells you, "It's nothing like any Shadow missive I've encountered before. Usually they speak almost as we do. This is... like dark poetry. I do not understand what this message's implications are."

We all one
One voice
One form
Praise
One
Beyond
Nameless
Eternal
All

Latecomer
Thieves
Bicker
Foolish

Herald
Seeks pain

Circle
Seeks power

Our body:
Shares not
These aims

Our body:
Carry tokens
Spread vision
All that serve
One
Not created
Or swayed
By latecomers

Our body:
Ready
Possible need
Act
Should Herald
Its circle
Neglect
One

Our body:
Loose Primes
Not-us-servants
Summon Breath
That turns
Loose opener
Of ways
Break bindings
Unravel web

Our body:
Sundering repaired
One
Quickened
Accomplish
Beginning-all-time
All-one-together
Change-constant
As once was
So shall be
Forever