Here's a re-write for more clarity and clue. I like this version a bit better anyway:
Friendless face for knuckles white
His hearse preceding on the flight
Emissary of the night,
Upon the heartless hearth.
Seven years removed of life
Locked away as those in strife
Architect of this his plight
Tally now thy worth.
Girded by a steely tail
Beware this missive else it wail
Duty now must never fail
His task upon the Earth.