Dudley's dungeon, 28 April 2005. Dudley decided to name a long sword as Newtbane, thinking that it would better kill newts. It did not work so well; Dudley fell to a newt named Dudleyrist. (In actual gameplay, a long sword named Newtbane is simply a long sword with a name, no better at killing newts than any other long sword of the same enchantment.)

Read the comic.

Compare with the Banes, Puddingbane, Vladsbane.