Loki has summoned Erza Scarlet from her world. He has promised to return her, if she is able to defeat the following foes.
Loki has greatly boosted her physical attributes and raw magical power. He has also augmented all of her equipment. Her speed and all of her powers remain the same, but it should be assumed that :
After each round she is fully restored. She is also able to keep trinkets from her defeated foes (yes she can lift Mjolnir... Because she's Erza)