Also known as: スピリット・オブ・マザーウィル, スピリット・オブ・マザーウィル(ACfA)
A six-legged, gargantuan Mecha-fortress (called "Arms Forts" in the game) from Armored Core: For Answer. Usually spelled as "Spirit of Motherwill".
A reconstructed copy model appear in Armored Core: Verdict Day as 'Spirit-Class Moving Fortress'.