Opening a dungeon with just a corrupted lodestone would give you 50%-75% umbral and no loot drops and obviously using an orb would give the regular rewards.
There could even be a tier above corrupted lodestone added so it isn’t so readily available but at least something I can go out my way to get even if it would take more time than grinder for the faction vender or just crafting one.
Pls let us know if something is in the works for this 