User blog comment:Nhan-Fiction/The State of Illaoi/@comment-3391671-20170212054828

I do find it that 's kit telegraphs her skills to much for what damage they do provide, neither does her kit feel like it supports its Tank-secondary classification enough, aside from it being a prerequisite if she wants to stay in a fight longer (which could be applied to just about any fighter/bruiser). In conjunction with the telegraphic nature of her ability, she's also absolutely slow as you state. While don't have as much qualms as you do about her laning phase, I do agree her teamfight should be less reliant on that ideal setup and have more options.

As for the changes you offer:
 * While she does become mana hungry here and there, I believe only her Q needs the reduction.
 * The heal from is unnoticable that I do not even consider it into my conscious decisions, such as "oh this will help me sustain." Thus, a lvl-scaling heal would be welcomed.
 * I was reminded of that one stick figure video where does grab  multiple times with the tentacles, so a soft-CC somewhere wouldn't be so bad.
 * While I am not big on itemization, I get the flow of what you are saying. I usually go tanky, and it's noticeable that I do not deal much damage.
 * Being able to proc with  would also be rewarding. There is always that moment where you wish the other tentacles would follow, but Q is the only one that doesn't actively interact with them.
 * On top of what you've said for, the animation doesn't look as "harsh" as it should, both because of its lack of fluidity and the speed of it.
 * The same (80% for 1.5 seconds) would be a nice touch for the snagging-portion of . It would make sense (since one's spirit is being literally yanked out of their body, if not into a state of souless-ness). I didn't notice until you mentioned this that she does lack any reliable CC.
 * I don't know about untargetability, as that feels like a lazy way to make her avoid dying right as she casts . Plus, other champions are similar in that they are still vulnerable when performing given large-scale actions.
 * A larger AoE may solve the "check for which enemy champions are hit. However, on top of that, I'm also rather unsatisfied with how the ability functions, as it's a simple Tentacle spawner based on who you hit and nothing else. One idea in mind would be to make all hit champions have a similar effect to becoming a Vessel, however without the spawning Tentacles mechanic (that would overlap too much with . If Tentacles
 * This comes to your next point of having it spawn a minimum number of Tentacles so there is consistency. Having a minimum (hopefully having a spawning AI that will make it do so in beneficial locations) would make for use when in a dense crowd of minions than it simply being used for champions.