Borderlands 4 How to Unlock The Legendary Grim Sister Siren Class Mod

The Grim Sister is a Vex Class Mod

Vex gains increased damage dealt the longer Incarnate is active, doubling this bonus of Action Skill damage. Additionally, when Incarnate ends, she causes a Phase Explosion.

Unlock Location:

• Progress through the (Subjugator and Thol the Invincible) Raid until reaching the Raid Bosses
• You will find Subjugator and Thol in the same boss arena.
• Defeat Subjugator and Thol to get a chance at the Legendary Grim Sister Class Mod.

Farm Method:

• Defeat both The Subjugator & Thol (Order Does Not Matter)
• After use the Encore Machine nearby to reset the fight.
• Repeatedly defeat Both Bosses until Grim Sister drops