who sealed zeref

[Akatsuki wise guy]

zeref is the strongest dark mage and the creator of all demons. he is also currently probably the strongest character. who would have been strong enough to seal him.

 

[amadeus15]

probably Mavis...?
sry dunno the exact timeline of Fairy Tail so i dont know if this thought is complete BS

 

[Uchiha Dan]

Uchiha Itachi did.

 

[I Am Pein]

Uchiha Itachi did.

lol xd

 

[aashish1996]

Uchiha Itachi did.

sure, why not? xd