
Servant of Darkness is the eighty-sixth chapter of the Fullmetal Alchemist manga, set within the Promised Day Arc and the twenty-first volume. Known in Japanese as Yami no Shisha, it was released in Japan on August 12, 2008, and in English on November 17, 2009. It follows The Empty Box and opens into An Oath Made in the Underground.
This chapter carries the number eighty-six and forms part of the Promised Day Arc, collected in the twenty-first volume of the series. It comes after the previous chapter, The Empty Box, and opens into the next one, An Oath Made in the Underground.
Sitting between chapters eighty-five and eighty-seven, the installment advances the Promised Day storyline as the final confrontation draws nearer. Its ominous title hints at forces bound to serve the dark.

Naruto vs Luffy with the twist nobody asked for: Luffy tickled Hinata on date night, and she kind of liked it. We break down the whole fight and commit to a winner....

There are no women on Namek. That isn't an oversight, it's the biology. Why we handed Piccolo the one thing his own species rules out, and why it had to be trap soul....
Chapter 86 is titled Servant of Darkness and is part of the Promised Day Arc, collected in volume 21 of the manga.
Servant of Darkness is known in Japanese as Yami no Shisha.
The ominous title Servant of Darkness hints at forces bound to serve the dark side of the conflict as the Promised Day Arc nears its final confrontation.
Servant of Darkness was published in Japan on August 12, 2008, with the English edition following on November 17, 2009.
Chapter 86 follows Chapter 85, The Empty Box, and leads into Chapter 87, An Oath Made in the Underground.
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