No there were hammers scattered all over the world, Sin found the first one which freed the Serpant Cul from his imprisonment by his brother Odin, that led to the transformation of Hulk, Juggernaut, Absorbing Man, Titania, Thing, Grey Gargoyle, and Attuma all they had to do was touch the hammers to transform. Tony Stark had to beg Odin to forge weapons and armor for the heros so they coulld fight back.