Onimusha dawn of dreams how do you get sokis dainslief sword

cant remember which level but its inside the Pagoda. As you walk in theres an enemy which carries the sword, looks like a Christmas tree, maybe it was luck that i got it but you must kill him walk out the building, walk in kill him again and keep doin this till he drops an item which is the sword, this swords attack power on max is unbelievable, i used it to destroy the boss.