Quick answer
The Black Needle comes from the Sester’s Gate route in Mammon. Cleanse/complete the relevant Sester’s Gate encounter and defeat the Stray Sesters to receive the weapon. Its most notable launch build is Genessa, where the spear can support Phantom stacking alongside Faithful Doubles.
Route at a glance
- Reach the Sester’s Gate Beacon in the eastern Mammon route.
- Enter the associated Sester encounter/dungeon path.
- Push through to the final Stray Sesters fight.
- Defeat the encounter and confirm the Black Needle reward.
Current guides use slightly different names for the inner Sester location, so the Beacon + final encounter are the most reliable landmarks.
Why Genessa players care about it
A full-release Genessa build test identifies the Black Needle as the key melee weapon for a Phantom-focused setup. The reason is synergy rather than generic “highest DPS.”
Faithful Doubles can copy important weapon behavior. Black Needle supports the same multi-hit/Phantom direction, so the Shell and weapon contribute to one stack-and-detonate loop instead of competing for Resolve and upgrade slots.
The launch Genessa loop
Summon Faithful Doubles → let them apply Phantom pressure → use Black Needle to add fast hits/stacks → trigger Phantom detonation → re-summon while the enemy is distracted.
The result is safer than a pure melee plan because the doubles create both damage and aggro displacement.
Is Black Needle required for Genessa?
No. Genessa’s identity is the summon/double mechanic. Black Needle is a strong launch synergy, not a lockout condition. Use another weapon if its move set feels better and revisit the spear once you are ready to build around Phantom deliberately.