For ten points, name these weapons, a famous example of which is King Arthur's Excalibur.
According to legend, one of these objects named Heaven's Will was owned by the Vietnamese king Le Loi, and  another one named Joyeuse was owned by a mythological version of Charlemagne. Roland owned one named Durendal, and Odin broke one belonging to Sigmund when he tried to attack him. That object, Gram, was later used by (*) Sigurd to kill the dragon Fafnir, and Beowulf owned one of these that proved to be ineffective against Grendel's Mother. Besides one named Hrunting, an item of this type was given to the Lady of the Lake and pulled out of a stone. For ten points, name these weapons, a famous example of which is King Arthur's Excalibur.
According to legend, one of these objects named Heaven's Will was owned by the Vietnamese king Le Loi, and  another one named Joyeuse was owned by a mythological version of Charlemagne.
{sword}s