Grave Marker of Bases (素体達の墓標 Sotaitachi no Bohyō, Grave Marker of Prime Fields) is a stage first appearing in BlazBlue: Chronophantasma.
The coffins contain failed versions of Mu-12.
The stage was altered in BlazBlue: Centralfiction, where the monolith is sealed by Kushinada’s Lynchpin.