I recently discovered that FromSoft made Evergrace; even though this game has been sitting in my closet for ages. It was and still is a tradition for FS to include the Moonlight Blade in most of their games; namely King's field and this. It took one whole playthrough, Stress from bottomless pits, and equipment blowing up in my face to make it into the dungeon just to get it. Dungeon was named "Shadow tower" (Another FromSoft game) and had four floors with monsters everywhere and rail-less bridges. I officially know where they got the idea for 3-2 from.. Anyway, after four story bosses and a extremely hard secret boss I was given the Moonlight Sword for my hard work. It looks the exact same and even has the signature dark souls Sonic Wave attack as a special skill. Now since I couldn't find a picture of the sword online anywhere, not even video, I took a picture just so everyone could see this.
Evergrace Moonlight Sword
Note: Only played evergrace because I never finished the game. From Software's logo popped up on screen and dark souls came to mind. I remembered watching a video and reading a comment about how FS always put the moonlight sword in certain games. VERY little information was found to aid me in finding it but what I found was enough to lead me to where it was at least. Sadly I couldn't record the dungeon and boss gameplay but that picture is enough proof for me.
Thanks for reading!