Side mission - Proof of Sabotage | Act 3 Dungeon Siege III Guide

After you help Sweatcog (M22,2) with his crazy automaton (Major Malfunction), the little goblin will ask you to find a part of the machine that will help him understand the cause of the malfunction. Head to The Crypts of the Sacred Blood (M21,X2) and take the gear from the table (M22,5).

The gear can be easily missed - it's visible on the screen above, on the table.

Afterwards return to the goblin engineer and collect your prize.

M22 - The Crypts of the Sacred Blood part 1

M21 - Stonebridge