I feel like the only way she'd know this is by being that girl. Dark.

Don't know how good an idea it is to contain a stone-manipulating entity in a rock

Li is probably the correct translation, as the standard li, as far as I can find, is a half-kilometer nowadays. Which would cut our speed in half, to 13 or 26 mph, respectively. Again, without breaks, but pretty well in the range of where the novel's general power level is at this point.

We can solve for km pretty easily. If we convert miles of distance to km, then we can convert mph into kmph. So if it's km, then 1000km still requires 42 kmph, and 2000 still requires 84kmph. That would equal roughly 26 or 52 mph, still with no breaks whatsoever.

It's not that I think there can't be super horses, just that this is so far above the realm of anything introduced so far.

The horses would have to move around 84 mph to make 2000 miles a day, and do so with no breaks or rest for 24 hours. Since you can draw a bow anywhere from barely enough to even have the arrow leave it to just shy of snapping the string or splitting the bow, I find this much more believable. It's just the thinking emoji, I don't know what you're talking about ( ͡° ͜ʖ ͡°)

In compound bows, you're correct. As far as recurve or similarly-styled bows go, you can overdraw the bow. While this seems a bit exaggerated, it's much more believable than the horses going thousands of miles a day.

To travel 1000 miles in a day, a horse would have to go roughly 42 mph, without any breaks at all, nonstop. Multiple thousands of miles, even just 2000, seems really really unreasonable. That's 84 mph. Assuming 24 hours to a day, I guess. If the days here are 78 hours or something, it might be feasible.

It's a staff that makes you cough, not an instant kill spell or something. Look up Chekov's Gun. If something is mentioned, it should be used. I think you're just being contrary, or you think you have to defend this, but it's not an insane trump card. It's a gag item with some use. I'm not going to continue this conversation. Have a good one.

The emerald flames are from when they use solus' omni-pocket

Then you know he could've used it here and taken it back to the succubus, which is even more reason to use it.

spoiler, I think? he talks to a succubus who recharges it to full. I don't remember if that's before or after this, but he can slow charge it himself as well. There's no real good reason not to use it here.

Amazon

He can recharge it more or less whenever, and the reason to have it is to use it. Preventing your ally from vanishing is a very good use.

I would consider it a scam because, in early levels, exp is a more scarce resource. You simply get less, hundreds instead of thousands, etc etc. This skill converts exp to energy, which is good, but converting it at an earlier stage consumes exp that could be used to level up and access more abundant exp. Ultimately, even if it doesn't harm players to make the tradeoff, it doesn't really benefit them. The only person it benefits is Han Xiao, who collects the fee from making the sale. Which, I'd argue, makes it a scam.

Phresia the Grendel was already killed near the beginning of the chapter though?