SCIENCE NOTE: Titanium isn't actually super-strong. It's about as strong as steel. Its advantage is that it's light, about 45% the weight of steel. It is the metal with the highest strength-to-weight ratio (it also has high heat tolerance and corosion resistance), but that comes from low weight, not any particularly high strength. Also, it's actually a low-density metal (which kind of comes with the whole low weight thing).
>Keep gathering the energy in the orb, then fire the energy as a beam.
[It's YUKARI. She can just mess with boundaries to make it Super-Titanium. Besides, Steel is pretty strong. Also massive lasers create a lot of heat and light. That's what they are. So a high heat tolerance is important.]
>Alright, let's put it between both hands, and have them out in front of us. With one hand on top, and the other below the orb.
>Then, start to compress the orb a bit, and focus on how we did that blast before, during the Shinki Incident.
>Then, raise the orb overhead, but keep it between our hands. "Yukari, you might want to keep on guard, this could be pretty destructive y'know. Because I'm goin' all out!"
>Focus, then bring our arms down and fire the Spark!
(Could just be a Super Titanium, the kind that's lightweight, but also immensely durable. Gensokyo and all that.)
> You take various poses and warn Yukari, who you note is now behind you.
> "Don't worry. I know you can't beat me." she chimes.
> You fire the 'Dark Spark' as Marisa fires a 'Final Spark'. You kind of have to cone your hands to funnel the energy from just exploding everywhere... including on you.
> It seems that both lasers penetrated the metal completely. Yukari then pops out of a gap, followed by two rows of metal plates.
> "I noticed one wasn't enough so I gaped more in the paths of the lasers."
> Marisa's row has five plates ruined, the sixth is pierced but not as badly, and the 7th has a small crater.
> Yours has just small piles of molten scrap left for the first five, the sixth has a hole in it with molten metal dripping down, and the 7th looks like someone strapped an explosive to it, with a larger dent.
> Marisa's dent in the 7th is deeper, but yours is more spread out.
> Yukari inspects the two 7th plates.
> "It's veeery close..."