How to get Grendel Prime Blueprint in Warframe?

Grendel Prime Blueprint 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 Grendel Prime Blueprint

Other items:
Grendel Glutt Helmet Blueprint - Grendel Prime Chassis Blueprint - Grendel Prime Systems Blueprint
Grendel Prime Neuroptics Blueprint