SLOTH

SL

Fullmetal Alchemist: Brotherhood · Antagonist

The largest and physically strongest of the homunculi. Has been digging a tunnel beneath Amestris for decades. Finds this enormously tedious. Everything is enormously tedious to Sloth. The name is the most accurate in the set: he is not lazy in the casual sense but in the absolute sense, a being so indifferent to effort that even his own destruction registers as an inconvenience rather than a threat. Brotherhood uses him for one extended brutal set piece involving the Armstrong siblings and Izumi Curtis and then steps back. He does not need more than that. He is exactly what he appears to be and the show knows when that is enough.
3 CONNECTED LORE ENTRIES

SLOTH THROUGH THE ARCHIVE //

BROTHERHOOD COMBAT LEDGER //

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Olivier & Alex Armstrong vs. Sloth

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Central Command Throne Room · Armstrong Alliance Victory

Major General Olivier Mira Armstrong and Major Alex Louis Armstrong joined forces inside Central Command to halt Sloth's relentless rampage, combining precise rapier strikes with heavy Combat Alchemy stone pillars.
The Breakdown
Sloth unveiled his true high-speed momentum, battering both siblings. Joined by Izumi Curtis and Sig Curtis, the group pounded Sloth continuously until his Philosopher's Stone ran out of regenerative energy, causing him to dissolve into dust.

FATHER & HOMUNCULI //

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Sloth — The Tunnel Digger

SPOILER! The slowest personality doing the fastest physical work Open →
Sloth spends years carving the enormous tunnel beneath Amestris that completes Father's nationwide transmutation circle.

His lethargic personality hides absurd physical speed and strength when he is finally forced into open combat.
Why it matters
Sloth's job is the giveaway. Long before the heroes understand Father's complete plan, the tunnel proves somebody has been treating the entire country like one giant piece of alchemical equipment.

STORY & ARC GUIDE //

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The Tunnel Under Briggs Makes the Shape Impossible to Ignore

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Episodes 33–35

Sloth's tunnel runs beneath Amestris on a scale no ordinary construction project could justify.

Once the shape is connected to old conflicts around the country, the heroes can finally see Amestris itself as a transmutation circle.
What changed
The battlefield is no longer a laboratory or city. Everybody living inside the national border is already standing inside Father's equipment.