MJOLNIR is a weapon that Loki accidentally acquired while teasing gods and dwarfs. Later, it was presented to Thor for use. The function of MJOLNIR is to pierce anything. If it is thrown out, it will hit the target without error, and will automatically fly back to the holder's hand after flying out.

One disadvantage of MJOLNIR is that the handle of the weapon is slightly shorter due to Rocky's mischief, but even so, MJOLNIR is still the strongest weapon in Nordic mythology. It is said that the head of the hammer is made of hard rock or iron, and the handle is made of the wood of Yggdrasil. When not in use, it can also be reduced and put in your pocket.

Source: @blackchurchtattoo