Greater Black Scythe Artifact has restrictions on where or how it can drop.
Greater Black Scythe Circle Artifact are currency items that can be dropped by Runic Monsters and Excavated Chests from Tujen expedition encounters. Can also be obtained with Dannig in exchange for Greater Sun Artifact.
The naming of the artifact progression has been changed: Common → Greater, Greater → Grand, Grand → Exceptional. [Undocumented This change was not documented by any official sources. It was discovered through player testing or datamining.]