Vanguard E1 Relic content

The Vanguard E1 Relic contains the following Prime components and blueprints:

Protea Prime Neuroptics Blueprint	Mesa Prime Chassis Blueprint	Volt Prime Chassis Blueprint
Caliban Prime Neuroptics Blueprint	Ash Prime Blueprint	Ember Prime Blueprint

Vanguard E1 Relic: Drop sources, locations, and probabilities

The Vanguard E1 Relic Relic is vaulted and doesn't drop in any mission currently.
However, players can still trade it or its contents.

Other items:
Rhino Vanguard Helmet Blueprint