Why does this chime scale with Intelligence? It makes no sense from a Lore perspective, since it's supposed to be used by Blades of the Darkmoon to cast Darkmoon Blade, a purely Faith Miracle. This also probably explains why Sirris does so little damage, she has a crappy chime!
Caitha's Chime makes sense, however, sense it is the Catalyst of the Goddess of Tears, and is linked to the Dark and Tragedy.
Velka's Chime would have been a better candidate, since it Scales with Intelligence in Dark Souls 1, but not Faith. However, spells like Vow of Silence is considered a "Dark Miracle" in Dark Souls 3, and Vow of Silence is a tool of the Goddess Velka in Dark Souls 1. It would have made more sense (to some degree) to have the "Dark Talisman" be Velka's Talisman.
Also, "Dark" Blade only scales with Faith, even though it is a "Dark" Miracle. Dark Miracles scale with Intelligence and Faith, so why doesn't Dark Blade?!? Now the game isn't being updated anymore, and glaringly obvious issues still exist. Thanks, Fromsoft.