Both at their best.
Erza can use any armor she wants.
Who takes this?
Jack, without much trouble.
Jack should win quite easily.
The question here is.... Can jack's katana hurt Erza? since she is not evil.
@DBZ_universe: for the thread, yeah.
@GeneralVan: Oh, well I think Jack has this.
His strength and speed is way too much for her.
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