According to most late Icelandic sources, Mjolnir is described as one of the most feared weapons in Norse. They related that is used to defeat all who challenge the supremacy of the sir. Although generally shown and described as a hammer, it is sometimes referred to as an ax or a club. One of the most popular myths about its origin is related in Skldskaparml, which mentions that the dwarves Sindri and Brok regaled forged and Thor as part of a bet Loki perform them.  
Mjolnir is the most formidable weapon in the arsenal of the gods and is used to kill anyone who tries to undermine the supremacy of the sir. It is listed as a club, an ax and a hammer. Mjolnir was able to bring down giants and mountains in one fell swoop.