It is explained that a sentient storm the size of a galaxy had once threatened Asgard, and after a fierce battle, Odin had managed to trap it within a nugget of uru that had been given to him by dwarven blacksmiths.
It is explained that the Mother Storm, a sentient storm the size of a galaxy, had once threatened all of Asgard. After a fierce battle, Odin managed to trap it within a nugget of uru that had earlier been given to him by dwarven blacksmiths.