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Erza Scarlet actually not only have one sword, she has at least 20 to 50 swords hidden in another dimension. All she needs to do is just summon them and rather fast too! That is why she will be known here as “Queen Erza Scarlet of Girls X Swords”
she has more than 100 swords =.= can be seen in fairy tail episode 46 and 47. *spoiler alert*