En Passant Ruins (アンパッサン遺跡, Anpassan iseki) is an ancient site appearing in MÄR Heaven: Oblivion of Clavier.
Toponymy and Origin[]
From French, "in the act of passing"; In chess, en passant is a rule that allows a pawn that has just advanced two squares to be captured by an enemy pawn that is on the same rank and adjacent file. The pawn can be taken as if it had advanced only one square. Capturing en passant is possible only on the next move.