Magnus Prime Barrel is an item dropped from Void relics.
You can find the list of relics below, and click on the links to see how to get them.
Relics dropping Magnus Prime Barrel
- Axi M5 (Rare) - Exclusive to the Void Trader (Baro Ki'Teer)
- Neo M4 (Rare) - Vaulted
- Axi M2 (Rare) - Vaulted