I play offline, and now that the offline random rift crystal gains are no more I would like to know if someone found a way to farm rift crystals fast, since now I need them to upgrade weapons and more stuff. Thanks
The Silver and Gold skeletal knights can drop a poopton of RC's. Other than that, as the previous people suggested, just run through BBI murdering things indiscriminately and you'll get RC's. The more powerful enemies can drop Bicrystals (2000) and I think Polycrystals (5000) as well. Perfect Rift Crystals (10000) I have only received from certain chests I think.