Whoops! My bad on forgetting about this. It completely slipped my mind. @_@
Temple of Nirvana:
To perform this, one would make a single hand seal and project their chakra to all who they wish to affect and begin manipulating their senses. This technique is actually more complex than previous ones because you're manipulating more than just their basic five senses, but are also now taking control of their mental state. This should be done by using your chakra to impress upon them the sensation of severe drowsiness, overriding their more logical senses to make them fall asleep on the spot if they don't notice and break the genjutsu. While the sense of tiredness is being forced upon the victims, the user also manipulates their sense of sight so they see feathers.
An interesting little trick I came up for this jutsu is to add to the deception part of it. The fact is, everyone knows that there's no reason to get tired during battle, so they can recognize that it's a genjutsu that way. However, if you do a bit of trickery to make your opponent think that you're dead, making them tired once they believe the battle has already been won is much more believable. Granted, random tiredness is kinda awkward in almost any situation. <.<
Well, the main limitation is that it's for some reason short range. I really have no idea why it's short, as it covered an entire stadium in the manga. Other than that, the obviousness of the genjutsu is annoyingly limiting.
The simple counter is to realize how silly and random it is to randomly get tired on the battlefield, and to use that as a reason to do something to break the genjutsu. Given that this bind you in no way, you could just use a kunai to cut your leg or something so you don't have to spend a jutsu.
Bringer-of-Darkness Technique:
To perform this, one would make a single hand seal and then manipulate the victim's sense of sight exclusively, causing all of their sight to go black, as if they're eyes are trapped shut no matter what they do, leaving them in blindness. The user can use this on as many people as they like, so long as the targets are within range.
I think that using this with silent attacks such as a simple shuriken toss would be most effective. Because this doesn't limit the sense of sound, most standard elemental attacks would be noticed as they approached that way. However, a true ninja attack such as a kunai or a shuriken toss would be silent, thus leaving the opponent unaware until it's too late.
The main limitation for me is that pesky hand seal. If the opponent sees you making a hand seal and then the lights go off, then it's pretty obvious that you had something to do with it, thus giving them an easy reason to break the genjutsu.
To counter, simply allow your bio to use logic. There are practically no real reasons for the world to go dark to this extent besides the genjutsu. Unless of course someone invented blindness no jutsu... But with the way things are escalating in our rp, that's probably a possibility. But yeah, using logic to know that infinite darkness is impossible and then breaking it via pain or pulse jutsu is the simplest method of breaking it.