Pre EoF, we had nightfalls that reliable dropped most of these resources. Even ritual playlist would regularly drops cores and prisms, but now we have no reliable way to earn these resources besides 4 gunsmith bounties and farming master lost sectors which is also unreliable and offers nothing else of value under the new system.
This is especially bad given how expensive it is to masterwork T4 &5 weapons and armor.
Its sad when I have to wait for an event,just to stock up on resources by using the event currency to buy them through the event store.
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Your ghost now has a mod for enhancement cores to drop.Ops can drop prisms and ascendant shards if you score high enough. solo and fireteam ops also only drop techsec armor so if you wear that set while farming ops and infuse with the armor that drops you will only need glimmer to infuse. I wore the 4 piece set plus my exotic helmet infusing as i went and swapping out for higher tier items as the dropped and dismantling all the lower level trash for unstable cores. I'm 436 sitting on just under 500k unstable cores.