Empty Cicada Shell: I really like this move a lot, I feel like it has a lot of potential to be used in different ways that might be seen as unconventional. But the bigger reason I like this technique is because it can add a layer of depth to the roleplay itself, which I find really interesting. Not that people really care for adding depth to that save for a few select people. But nevertheless, I do like the technique, lots of uses.
Advantages are being able to mask your position, which makes it a great compliment to stealth tactics (lol). Meaning you can disguise where you are, as well as how many people are on the battlefield, obviously. There's not really a lot to say about the advantages, it's basically just capable of projecting your voice somewhere else. I guess this would be a good ability against the Inner Sonar jutsu, which I know a lot of people love to abuse. Then again that would probably be seen as metagaming, so it's not the best idea. I suppose if people actually wanted to RP, you could use this technique to induce the power of suggestion. Perhaps you could combine this with the Transformation technique to pretend as one of your opponent's comrades in battle, or simply by disguising your voice and give commands like telling them to watch out to their left or whatever, and attack from the opposite direction.
It could also be used in a sense for your allies, or shadow clones. Being capable of giving commands to people who may not understand hand signs or other codes in the heat of a battle could be helpful.
I dunno, it's got a lot of potential at least, but most of it will come out when I use it in battle.
Disadvantages are... well there's not really many. If anything, there would be the case that it only projects your voice somewhere else, not necessarily amplify the volume. Meaning if you used this technique to yell, you'd likely still hear where the source of the sound is as well.
Can this technique only be used in one area? Or can you use it to accentuate your voice in seperate areas with one single use of the jutsu, for example I project my voice to your left side, and then to your right side?
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Silent Homicide: It seems as if this jutsu has a lot of freeform ability behind it, or its at least left ambiguous for the sole reason that you can do whatever you want with it. Is it a move with the intention of killing someone? Yeah sure, but that doesn't mean I'm going to use it in that way, nor do I really have to.
Typical advantages are it's used to disguise your movements. Like the previous technique, it's reliant on hiding the sounds you're making when you're going in for the kill. I'm curious as to whether this can be used to disguise other noises you may make, such as hand seals, or grabbing your weapon to kill someone. What about natural sounds, like stepping on a small branch in a forest, or water splashing in those kinds of areas...
Needless to say, there's a good reason to hide behind a veil of smoke when using this technique. Our eyes and ears are the main two senses we rely on in battle, and being able to prevent our target from utilizing those senses while we go in for the kill is the best way to use this jutsu. I guess you could use it as a means of hiding your escape as well, at least I like the idea of that. Since the technique is used by using chakra to muffle the sounds you make, it would be a good way to add confusion to your target, and throw off where you really are. These kinds of moves give a lot of creativity, and I'd love to experiment with them.
I really don't see any downsides to this technique. There's a lot of freedom with it, which I'm not going over again. If anything, and I'm nitpicking here: you can't use another technique while disguising your sounds, as that would mean using your chakra for something else.