An Immovable Sword - Flaming Katana quest in Perion

I am attempting to get a Flaming Katana, and according to other forums apparently the NPC is the Mysterious Sword in Perion, and you need an Undine's Cloth to start the quest. Unfortunately, this either is not the case, or the quest has gone bye bye. I suspect that I need all of the erasers to start the quest, and that the information was wrong, but I am reluctant to track down the last eraser that I need, in case the quest doesn't work.

My question is, does anyone have any information on this quest, or knows anyone that has done it, who could confirm how to start it? I'm stuck lol

Thanks!