Unlock Location:
- Complete the Main Story Mission "Shadow of the Mountain" to unlock access to the Auger Mine.
- Start from the Fast Travel Station in the Carcadia District in the Dominion area.
- You will find a Auger Mine to the east, at the end you will encounter the boss Axemaul.
Farm Method:
- Defeat Axemaul at the end of the Auger mine "Toil of Spoiling Vis".
- Use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Axemaul until
Kill Spring drops.