This guide will let you know where to farm Neo Relics in Warframe. Go through the guide and follow all the instructions carefully to farm them.
The first two places you can farm for neo relics are on Ukko in the Void; it is a capture mission that has a chance of dropping ether neo or meso relics as a completion reward. And Mithra in the Void, an interception mission that can drop neo relics as A and B rotation reward, rounds 1,2,3, 5, 6, 7.
The next place is UR on Uranus, it is a disruption mission growing in the center, and neo relics can drop as A, B, and C rotation rewards, which you can get on every round. It is not recommended to farm from this mission if you are newer.
To get the B rotation rewards for round 1, you need to defend all four conduits and defend at least three conduits for round 2. For round 3, you only need to defend two conduits to get the B rotation rewards, and if you want C, you have to defend all 4.
For round 4 and up, you only need to defend one conduit to get the B rotation rewards and three conduits for the C rotation rewards.