Any Videos on where this is? the wording is very vague

I checked that road up and down and even killed the troll knight, still can't find it.

It drops from a Blue Giant on the road directly north of "Liurnia Highway North" Site of grave.

Ok this page requires correction the page list the swords location as "Liurnia Highway North just north of the site of grace, along the road." it is not along the road. The correct location would be as follows "North of Liurnia Highway North you will find a group of soldiers engaged in battle with phantom puppets as you approach a phantom troll knight will appear felling the phantom knight will result in him dropping the sword as an item"

Ok, I've killed this thing 4 times and it hasn't dropped??

Killed him about 30 times before i got it - also if u get the site of grace behind him (by the broken bridge) u can go straight to him

need to farm blue ghost troll , I got it after about 15 troll

in between the "gate town bridge" and "liurnia highway north" graces there is a blue ghost troll armed w/ sword who will get summoned to fight some soldiers. he drops the sword

There seems to be a more optimal source of this weapon, which is a sword wielding troll inside a castle that is due north west of the magic academy. My friend and I both got it after killing it once so it may be a guaranteed drop