From Team Fortress Wiki

“ — Purity First Sarif has declared war on humanity. They manipulate you with their technology. ”

The Purity Fist is a community-created promotional cosmetic item for the Heavy. It is a heavily-augmented biomechanical limb with a Sarif Industries Logo near the base of the arm that replaces the Heavy's left arm.

The Purity Fist was awarded in Genuine quality to players who pre-purchased Deus Ex: Human Revolution on Steam before August 26, 2011, and to attendees of the Square Enix booth at PAX Prime 2011 and the 2011 New York Comic Con.

August 18, 2011 Patch (Manno-Technology Bundle)

The Purity Fist was added to the game.

July 10, 2013 Patch (Summer Event 2013)

[Undocumented] Updated the item type to "Cosmetic Augmentation".

Bugs

If a Spy disguises as a Heavy with this item, the Spy will only have the arm robotic, but not the hand of the Heavy.

Trivia

The Purity Fist is a word play on "Purity First", a radical anti-augmentation group in Deus Ex: Human Revolution .

. The texture of the fingers is the same texture used on Heavy's ammo belt.

Gallery

Promotional Steam pop up for the "Deus Ex" items.

Purity Fist concept art.

PAX Prime 2011 Purity Fist Voucher Front.

PAX Prime 2011 Purity Fist Voucher Back.

Adam Jensen using his cybernetic arm.