Sunder and Wraithguard - Editable Vault Cell (Cell Bug Workaround) Mod
MODSunder and Wraithguard is unfortunately set up as an ESM flagged ESL, which means that any mod attempting to touch its new cell, or any of the linked references in Sightless Pit, cause the cell to break.
With version 7.0.14 and up, SSE Engine Fixes provides a true fix for this bug, allowing all edits to the original cells.
Since mods made that way are fundamentally incompatible with anything made with this worse duplicate cell solution, this mod should be considered obsolete and, following updates to dependent mods, will be hidden.