Rhythm is a 
Order Pistol
Its special effect is Tempo - firing a 3 Charge Stacks deals +200% Cryo Damage and refunds its ammo cost. Reloading changes the charge speed.
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How to Unlock The Legendary Rhythm Pistol
Weapons
Legendary Loot
Overview
How to Unlock
Unlock Location:
- Activate The Arcade Invade, Vault Card.
- Earn Points by completing challenges and leveling up.
- Once you have enough points you will are able to purchase the Rhythm form the Vault Card.