Errors in the archives

Actually, most of that is wrong

Mugendai-Yaiba, the Infinity Blade, uses power based on the HP of the wielder. it was destroyed, and reforged as the blade Ker got to fight the Legendary Evil. This is why in CMC it does damage based on your lifepoints.

Kyuukyoku-Yaiba, the Terminal Blade, is infused with the same sort of power as the Melody of Finite. It is an anti-Eternal weapon, which makes an Eternal mortal while it cuts. This is the weapon used to defeat Eternion, and was then got by Eternion and used to take over the Council.

The quip about Argent's sword appears to be a mistake in the comic. It should said "your enemies held during the war". Wonder how I missed that.