Caladbolg derives its name from an ancient Welsh sword wielded by Macsen Wledig. And it is known that Caladbolg was another name for the famed sword Excalibur used by King Arthur.
The meaning of the name Caladbolg is "Hard-Lightning" or "Lightning-Shard" calad-hard, bolg-lightning. The sword is said to have been able to cut an entire hill in half with one fell swoop. It was an Irish sword that was believed to be similar to King Arthur's Excalabar
i used my caladbolg to cut my yard in half