Appreciate help identifying how many Asgardian Mjolnir-like hammers exist and who currently wields them. For the purposes of this discussion, let's include Stormbreaker, Thunderstrike (which admittedly is more mace, than hammer), and other Mjolnir variants.

I'm working on a story where the lore of the Asgardian hammers plays a key role. A major threat to the 10 Realms (which will grow to 12 Realms by story's end) approaches and Odin summons all of the hammers of power to Asgard along with their current bearer. Only... one of the hammers is not a hammer at all. And Odin doesn't recognize its origin.