An unnamed Sankta nun from Integrated Strategies #5: Sarkaz's Furnaceside Fables.
She first appears in the encounter node "The Pious Worshiper" that triggers a battle, similar to those of:
- An unidentified Cautus's encounter node "Damsel in Distress" in IS1.
- Chained Sarkaz Girl (Arknights)'s encounter node "Shackled Bloodline" in IS2.
- Dancing Sarkaz Lady (Arknights)'s encounter node "Dancing Chests" in IS3.
- Basket Sarkaz Lady's encounter node "Northwind Witch" in IS4.