Swarm is a 
Ripper Energy Shield
Swarm's special effect is aptly named Swarm - when Energy Shield breaks, spawn Kill Drones that charge a nearby enemy, deal damage and restore shield. Kill Drones recharge with Shield is full.
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How to Unlock The Legendary Swarm Shield
Legendary Loot
Shields
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 Swarm Shield form the Vault Card.