Out of curiosity, does anyone know what the literal game translation of this Great Katana is? -Razorcat 19:27, January 22, 2011 (UTC)
Ame-no-Ohabari (天の尾羽張, lit. "Tail-feathers of Heaven") Dieth 03:51, February 23, 2011 (UTC)
Did some testing today using this on Sam/rng and did over 30 sidewinders and tachi: kaiten never became available so it seems the 13 weaponskills have to originate from the great katana.