How to get Grendel Prime Chassis Blueprint in Warframe?

Grendel Prime Chassis 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 Chassis Blueprint

• Lith C12 (Uncommon)
• Neo S18 (Uncommon) - Vaulted