Best place to farm Meso relics?

[MUTZILA20]

Yeah, i've beaten myself up these days trying to find a place that drops meso relics, endless missions that is.

I'm specifically looking for the Meso B1 relic (the one which contains the Boar Prime stock).

Please do not recommend spy/sabotage missions since it takes too long to complete those and I need to get the relics before the Vault gets sealed again..

[Vol4ica_]

http://warframe.wikia.com/wiki/Orokin_Derelict
Survival rotation A. The least random set of relic rewards for getting B1.
If you are interested in my experience, 90% of my rewards there were relics.

Edited July 20, 2016 by Vol4ica_

[Grimlock84]

i might be off but if i remeber B1s drops from when i farmed it. it only really drops in spys and derelict