[Zeromus_X]

You know the second area? After the save point, I think. It's a stairway leading up, and the next area is the place where Marilith is. There's a ledge leading outward; when you go onto it a '!' sign will come up like when you find all the other Memoria weapons. Just press X and you'll get The Tower. It has Small as a status effect, useful, but I prefer Masamune's Death Sentence.