You can’t make a top ten list without including Soul Edge. This sword isn’t just huge, it’s the source of so much turmoil in the Soul Calibur franchise. It made Siegfried into Nightmare after all. You know, before Siegfried managed to break free of the corruption only for the sword to manifest into a completely new Nightmare.
For a corrupted sword, Soul Edge is pretty sick - no pun intended, but it does have some pretty crazy variations the more corrupt and powerful Nightmare gets. Not to mention, it gets bigger!