Pretty much the final fight in chapter five but your on Arg'ils side and you wield the Blood Fallen sword/Waterbrand

[ Player and user are NOT the same person btw ]

[ user was/still technically is the Waterbrand Guardian, and they work with Arg'il, but since user has killed so many people the Waterbrand is now called The Blood Fallen Sword. ]

[ also I know that 'Waterbrand' isn't that much of a creative name for a like fanmade(?) SFOTH sword but I'm not good with names so suck it up ]