Ornn Theory; Considering he is mountainsmith and maybe a drawf? what if he's...
like the title, maybe he is a dwarf considering he's a blacksmith but sharjo just told that he is a huge giant so my theories are
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he is the brother of
because look at
, he has the dwarf characteristics but the enlarge size of it (ex. just make a bug big like that and its just the same but larger) and Gragas has no new lore... maybe a revamp of gragas lore? making him into a myth like state too? look at janna. she became an elemental spirit .. so its not immpossible -
he is a brother of
because they are both legends/myths and considering Orn has siblings says sharjo. Or the opposite, the one who was challenged by 
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Why not both.
Sorry if these wild theories are here all of a sudden.
except the originals (ie. Avarosa and Serylda instead).