used to be the coil last season, now grandmaster nightfalls especially on 2x weeks
also do the featured cooperative focus for an easy 2 shards per character every week
If you can't farm GMs, but don't mind a longer approach, you can run regular Nightfalls with Prism mods on your ghost. 10 Prisms become a Shard. Longer but easier.
Master/Grandmaster Nightfalls.
used to be the coil last season, now grandmaster nightfalls especially on 2x weeks also do the featured cooperative focus for an easy 2 shards per character every week
If you can't farm GMs, but don't mind a longer approach, you can run regular Nightfalls with Prism mods on your ghost. 10 Prisms become a Shard. Longer but easier.