User blog comment:Miskos3/Fairy Tail 539: World Destruction, Review/@comment-5708675-20170610193608/@comment-7418318-20170611102619

I'm pretty sure that Erza didn't loot anything.

She was under time-pressure and emotional strain to get to Jellal and after the battle there certainly wasn't much of a chance to get the sword out of the exploded Tower of Heaven.

And that is if the ability came from the sword to begin with. It could just as well be an ability of Ikaruga herself and the sword might just have been a plain, non-magical one.

Though at least in the manga Ikaruga just dropped the sword, so it's theoretically possible, unlike in the anime where Ikaruga's sword was shattered, along with one of Erza's two swords.