Fergus Mac Roich owned one named Caladbolg, which was used to destroy three hills while fighting against Conchobar Mac Nessa.  
Fergus Mac Roich owned one named Caladbolg, which was used to destroy three hills while fighting against Conchobar Mac Nessa.  In Norse mythology, a cursed one called Tyrfing was created by Dvalin and Durin, and the river Gjoll contains several of these objects.  The fragments of another one were eaten by Amaterasu in a contest with Susanowoo, who extracted another one from the severed neck of Orochi.  In Greek legend, after switching places with Dionysius II for a day, Damocles saw one hanging from a thread in front of him. FTP, name this type of weapon, examples of which include the aforementioned Kusanagi, Beowolf's Hrunting, Roland's Durandal, and King Arthur's Excalibur.
Fergus Mac Roich owned one named Caladbolg, which was used to destroy three hills while fighting against Conchobar Mac Nessa.  
{Swords} or {Knives} or {Blades} (accept reasonable equivalents)