How to get Spira Prime Blueprint in Warframe?

Spira 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 Spira Prime Blueprint

• Lith C5 (Common) - Vaulted
• Lith N2 (Common) - Vaulted
• Lith V4 (Common) - Vaulted
• Meso S9 (Common) - Vaulted
• Meso V1 (Common) - Vaulted
• Meso V3 (Common) - Vaulted
• Meso V5 (Common) - Vaulted
• Neo S13 (Common) - Vaulted