I've said it before, I'll say it again. This is almost certainly some type of either A) Damaging spell that produces something like 5x enmity making a 500-damage nuke turn into 2500 enmity without +Enmity mods (Ninja's Provoke), or B) Just a flat Enmity boost on top of everything. I'm saying that looking at the animation, I'm leaning toward B, but it could still go either way.
My money is on a protection effect. Cast this after Utsusemi:Ni & it has a duration of effect. Either you don't lose enmity when your hit or doesn't interupt your next shadow cast. It is an Ichi spell after all and casting it effects your dps so I'd expect some nice compensation. I could go for a healing effect aswell, but honestly that's not how nin is played.
Combining words aisha and soshi, my best guess would be something related with meditation, which may refer to something like regen, regain, HP recovery, convert damage taken to HP for a limited time, perhaps a sort of Dread Spikes,...
nin isn't played as a tank either but it evolved into it...so who knows...this could make it evolve into something else..
I played nin at a time when it was the tank for just about everything. So I'd like to see that come back a bit. "How it's played" nin has never had anything to do with healing, so that's all I was comparing it to when it came to people talking about a healing or reraise spell. Nin may not have started out as a tank, but the ability was always there unlike the healing thing.
actually given that they said they wanted to give ninja the ability to generate hate spikes, how about a tool based voke of some sorts. It is afterall, 30 sec recast and by voking, you're allowing others to live.... i dunno.