@Greyzone
Then you didn't read it. It's a ridiculously convenient, bordering on contrived spell and they didn't offer a good enough explanation in either the LN or WN, at least as far as I remember. And checking up on the wiki:
This magic uses Spirit Magic to create small water droplets shaped by Water Elementals to create lenses that focus light into laser beams that are deadly to humans even at Rank A like Folgen. Smaller water droplets are then used as mirrors to redirect the lasers toward the targets.
This process is very energy efficient the attack itself uses no Magicules, Natural Energy, or Spirit Particles, so any anti-magic barriers are entirely useless against the beams.
This is the explanation for the spell. It'd be one thing if this water was explained to be ten thousand times more efficient than regular water at refracting and amplifying light, but the point remains, there was no explanation given and if it's regular water managed by spirits, regardless of whatever genius is organizing the light, this outcome is impossible. It's based on real science, but expanded to a ridiculous point; the magic was never expanded upon enough to justify what the story did.
The point is I think this magic should
A)Be consistent with in-world logic, and since this manga is using real physics as an explanation, it should be consistent with real physics. But since this is impossible with real physics, it should have been clearly twisted and explained with magic to make it possible.
B)It's ridiculously overpowered and lazy since it's "very energy efficient the attack itself uses no Magicules, Natural Energy, or Spirit Particles, so any anti-magic barriers are entirely useless against the beams." and therefore irritating from a story standpoint. It's the perfect spell that appeared out of nowhere and it has very few downsides.