Blood Analyzer is a 
Maliwan Repkit.
Blood Analyzer On use, grants immunity to last Elemental Damage taken for 7 seconds.
- this Repkit is best for dealing with Mobs & Bosses with High Elemental Damage.
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How to Unlock the Legendary Blood Analyzer Repkit
Legendary Loot
Repkits
Overview
How to Unlock
Unlock Location:
- Progress through the story until reaching Dissected Plateau Region.
- You will do a Main Quest called "A Lot to Process" .
- Complete the Quest and at the end you will find The Oppressor.
Farm Method:
- Defeat The Oppressor.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat The Oppressor until Blood Analyzer drops.
Vex
Amon
Onslaughter
Phase Phamiliar
Dead Ringer