I plundered a Plauge fire blade with bloodfire and a Grim hound blade with cursed ice i defeated a enemie with Plauge fire blade so it was on fire switched to grim hound blade and some how my grim hound blade looked invisible with fire
it works with any sword tried it with my bruisers cutlass did the same thing but with a red color
Used cursed fire on my Spine crest blade it stoped the fire and made the sword look completley invisible.