Peerless Transformation, as expected from such an exaggerated name, seems painful just from seeing it. Mixing that technique with defense piercing seems formidable.
If I recall correctly, I heard Rishia was taught everything from the style. Then that means she could fight with weapons besides the current ones I suppose.
On a side note, Rishia's current level is 70. The fact that her strength did not match her status honestly surprised me quite a bit. How should I put it, "Who is this girl?", is the feeling I get.
Just guessing, but if Itsuki saw the current Rishia, it feels like he'd say, "Please come back." Well, Itsuki is maintaining a perfect hiding in Zeltbur with a broken mind though. Just stay like this in perfect hiding until the world becomes peaceful.
"Is that so? Though I can't really tell the difference myself..." (Rishia)