There is an RNG bottleneck for Ghosts and Relics (Destiny)

by Kahzgul, Monday, October 03, 2016, 17:42 (2962 days ago) @ Earendil

The flaw is that you can't really farm ghosts and relics.

For ghosts:

366+ LL ghosts only come from the raid and faction reward packages, and it's totally random as to whether one will drop or not. I've seen speculation that they could be more likely to drop from "Armor" packages, but not evidence to back that up. Presumably ghosts will also drop from Iron Banner as they have in the past, but with the many changes to IB this time around, we do not know that for certain.

351-365 LL ghost upgrades can also be had from heroic strikes blue drops.

350 LL ghosts can be purchased from vendors. Everyone should easily be able to get 350 LL for this slot.

For relics:

366+ LL relics only come from the raid, as a random drop after Trials matches (or from gold tier trials bounty), or Eris Mourne rep packages.

351-365 LL relics can also be had randomly when decrypting a legendary engram. There is no way to predict this and the event is rare. They may also be heroic strike drop blues that are of this light level, I'm not sure.

350 LL relics can be purchased from IB vendors upon completion of a quest, one per week per character.

Because there are no exotics in either slot that you can decrypt to use as infusion fodder, players with a specific need are stuck either farming Eris Mourne rep for relics, which is dumb, since that's SO last xpac, or just generally farming faction rep, which basically is the same as saying there isn't a way to specifically farm for a ghost so GL.