Unlock Location:
- Progress through the story until reaching southwest of The Fadefields.
- You will find a Drill sight icon to the bottom left outside of Fortress Indomita.
- Complete the Drill Sight called "The Pitted Stain" and at the end you will face 3 mini bosses.
Farm Method:
- Defeat the 3 mini bosses in The Pitted Stain Drill sight.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat the 3 mini bosses until
Chuck drops.