I might not have been exactly clear before and for that I apologize but most if not all of the metal that falls into the lake is collected by a scavenger Grimm that lives in the cave next to where the mound of metal it located. Not much escapes this particular Grimm and that stuff that does is generally carried off by underwater currents into an underground stream system that stretches for miles. Bottomline is that the lake floor wouldn't be littered with daggers. Also stuff like this doesn't fall off the cliffs that often. The treasure pile Shiro is looking at is years worth of lost jewelry, weapons lost during training, stuff that's fallen off of airships or fallen from the airdocks. Years worth, it's not like the lake is a giant refuse pit.
I'll revise my post to reflect this.
How exactly does he control something a mile away if his semblance is sight based? Also what makes his R-Types different from anything else. And if he "can't use his semblance on anything outside" his 50 foot range how does he control things up to a mile away?
If he is already focusing on it he can take it out of the 50ft range, like what he's doing with his new R-Types. Like I said before, the reason he had to use two new different R-Types from The Kingdom instead of the ones already in the lake is because they're out of his effective range after he stopped concentrating on them to read Sapphire's mind. Once he already has them focused however, like when he sent the first two into the lake, he can take it much further away. Once he switches to something else like Sapphire, he needs to use the other R-Types within his current range.
The reason he has a 50ft range is how far he can keep his mind multitasking on both his R-Types and his surroundings. Unlike most puppet-masters he can fight just fine in a melee while having his R-types move around and shoot as long as they're 50ft close to him. But once they're past it they'll either drop because they're too much of a pain to concentrate one, or Ebon will have to start dividing more of his attention to them as well as to whatever is going on around him, which could be risky depending on what's going on.
As for how his R-Types are different, it's by machine each are made with: Ebon has a unique sort of machine that responds to his telepathic Semblance as a sort of "Beacon", making it easier for him to detect them. It's something of a blessing and a curse: With it he can use his Semblance with his R-Types easily, but it also limits what sort of R-Types he could make since they'll all be based around this device. I intend to have Ebon eventually hone his Semblance to the point that he won't need these devices anymore and could use it on any object he's aware of the location of. And he would know where the R-Types in the Kingdom are.
