Talk:Omen/@comment-206.45.76.198-20151213180742/@comment-4010415-20151213235701

We don't know that it was specifically her sword that created a portal. We've seen other characters using their weapons with their Semblances before.

Glynda uses her crop while using her telekinesis Semblance all the time, like she's using it to focus her Semblance and target things.

In Players and Pieces, Weiss held Myrtenaster up pointing in line with her other hand while she made the big glyph to catch Ruby, then swung Myrtenaster when she had the glyph launch Ruby.

So, either the portal is Raven's Semblance, or Raven is a Maiden and that's part of her magic power.