Extra Medium is a 
Maliwan Energy Shield
Extra Medium Explodes on fill & depletion, dealing [amount] dmg.
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How to Unlock the Legendary Extra Medium Shield
Legendary Loot
Shields
Overview
How to Unlock
Unlock Location:
- Collect all of the Vault Fragments in The Fadefields.
- Travel to the Dissected Plateau sub-region.
- Proceed through the Vault Entrance Arch of Inceptus.
Farm Method:
- Defeat Inceptus.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Inceptus until Extra Medium drops.
Vex
Phase Phamiliar
Loveless
Visual Paradox Nexus
Plague Star