The Star Helix is a 
Daedalus AR.
Star Helix is an assault rifle that fires 3 bullets at once in a Helix pattern and can be fired vertically or horizontally.
Can be found in the Elements: Kinetic , Shock
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How to Unlock the Legendary Star Helix Assault Rifle
Weapons
Legendary Loot
Overview
How to Unlock
Unlock Location:
- Progress through the story until reaching "The Timekeeper's Order" a Main Quest in Dominion area.
- You will encounter The Primordial Guardian Timekeeper, the last major campaign boss.
Farm Method:
- Defeat The Primordial Guardian Timekeeper and finish the main story mission.
- After completing the story mission, return to his arena.
- Use the Encore Machine nearby to reset the fight.
- Repeatedly defeat The Primordial Guardian Timekeeper until Star Helix drops.