Board Thread:General Discussion/@comment-6192846-20140612134000/@comment-5131141-20140812040614

Super late answer, I know, but the words I heard referring to the "Demon Sword" were most certainly "魔剣" (Maken), so, unless Mothy decides to use unconventional kanji (very possible, though), it doesn't seem like the song will be using 刀 in that part.

On another note, adding fuel to the Nemesis poem being canon, one of the lines we know from Master of the Hellish Yard is "The time has come to turn it all into nothing", which mirrors one of the lines from the poem quite nicely.