Kaos is a 
Daedalus AR
Its special effect is Impact - Killing an enemy creates an explosion dealing damage.
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How to Unlock The Pearlescent Kaos Assault Rifle
Weapons
Overview
How To Unlock
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 Thol to get a chance to fight Subjugator one on one to get the Pearlescent Kaos.
Farm Method:
- Defeat Thol first, then defeat Subjugator
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Both Bosses in order: Thol first, then The Subjugator until Kaos drops.