[quote=@6slyboy6]
Oh btw for all of you people still thinknig that Yin is a nausea inducing curse attack (which it is not) let me quote offical sources about Shamak:

"The target becomes unable to sense where they are, however they can still feel the ground and sense what's happening to their body"

It also lets out smoke screen, which was mentioned for Ur Shamak:

"Ur Shamak covers the area in darkness like Shamak except the opponent can't tell anything while under its effect, such as where they are sitting or standing. Those affected by it can be snapped out of its effects"

Now if you execuse me, I need some time to swear as I keep seeing all the stupid things about random big ass fog clouds and everybody throwing up cause they have extremely weak guts. Thank you.
[/quote]

it is curse like, which I implied. Builds in the body similar to a curse. Not a curse. Curse-like, which is how it is described as. Curses are completely different in terms of mechanics. 

Tbh the AoE thing might come from the author's description in the web novels of Subaru's Shamak, which is the only one that has really had any outer perception upon it, which is a bloom of smog, and pucks & Beatrice's use of the spell of Subaru for the feeling. Since Subaru is a bit unreliable just based on the way his gate works, I can only really work on the author's descriptions of his ability in the novella for the appearance, and when your senses are fucked with it can cause nausea as seen in the novella [and I believe they had a display in the show as well when Puck uses the ability on subaru].