How to get Epitaph Prime Barrel in Warframe?

Epitaph 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 Epitaph Prime Barrel

Other items:
Epitaph Barrel - Epitaph Blueprint - Epitaph Receiver
Epitaph Prime Blueprint - Epitaph Prime Receiver