Thus, Thor's Hammer not only represented destructive power, but was also a symbol of protection and security from the evil and violent forces. Thor's Hammer amulets were often worn as a symbol of healing and protection. Even today, Mjolnir pendants are worn as religious symbols around the world by those who practice the Germanic Neopagan faiths.
Every Character Who Has Lifted Thor's Hammer - IGN
Much later, Mjolnir was bequeathed to his son Thor, after he proved himself worthy through several trials.  With few exceptions, Thor has carried Mjolnir throughout his adventures. Thus, the history of Mjolnir follows that of Thor. Although Asgard was destroyed in Ragnarök , Thor and the hammer, survived. 
Wilson Audio: Thor's Hammer
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Sadly, Thor's hammer isn't having the best of days when Hela gets ahold of it in " Thor: Ragnarok." (Don't worry, we won't spoil it for you.)
While there weren’t outright tests given to Thor, he wasn’t able to use Mjolnir until he had defended Asgard against evil outside forces, retrieved the apples of immortality from Storm Giants, and rescued Lady Sif from Hela . Once he had proven himself selfless and brave, Odin presented Mjolnir to Thor and held a banquet on Asgard.
The Thor grew up alongside his adopted brother Loki , the trickster, who was always jealous of his more favored sibling. Thor grew in power and popularity and on his eighth birthday, Odin had the hammer Mjolnir created for him, enchanting it with powerful magic. Odin decreed that Mjolnir would be presented to Thor when his son had been proven a worthy warrior. After spending the next eight years training and performing heroic deeds, Thor was given the hammer and declared the greatest warrior in Asgard.
Unlike a wooden stake, Thor doesn’t have to be quite as precise while using Mjolnir. All he has to do is throw it at his intended target, and even though a vampire can move faster than his usual foe, it’ll still hit its mark. Mjolnir only has to strike a vampire in order to turn it to dust.
That first appearance of the hammer didn’t feature a name for it yet, just referring to Mjolnir as “a mighty hammer,” and at the time, Donald Blake didn’t know his real history as the Asgardian warrior.
Mjolnir’s story of being forged has changed a few times in the comics. One story of its origin had it being created in the heart of a star, one the Marvel Cinematic Universe decided to borrow for its movies.
Loki took this opportunity to release the Midgard Serpent, the beast prophesized to kill Thor and start Ragnarok, the apocalyptic end of the Asgardians. Despite his weakened condition, Thor was able to kill the Midgard Serpent and, thanks to Hela’s curse, Thor survived the battle although his body was completely broken and battered. Loki then sent the enchanted Destroyer , an animated indestructible suit of armor, to torment Thor but instead, Thor managed to send his spirit into the Destroyer armor and take command of it. He traveled to Hel in the Destroyer and began wreaking havoc. The desperate Hela had no choice but to fully restore Thor’s original body and release him from her curse.More pictures: «Hammer of thor supplement malaysia location».