Illaoi needs a power readjustment.

her ult is way too strong with her w, her q active is way too weak, and her e has no counterplay

great ways to change her while retaining her skill, and viability without making her too powerful:

first, her e shouldnt activate if you get out of the range. why do you get punished for running away? it just allows any illaoi to snowball extremely hard in lane. speaking of her laning strength. her ult is impossibly strong at stopping ganks. she can easily 2v1 almost any combination if she gets her ult off. Rather than reducing the range of her tentacles, i feel it would be much better to move the heal from her q to her ult. This would prevent her from quickly maxing q and becoming nearly immortal after ulting in the early laning phase. Her q active is simply just a poke. However it feels pretty hard to land for just a poke. adding a heavy but decaying slow could give her great chasing power.

if you dont like these changes, im sorry. her kit is very strange, and it feels like changing one small thing about her would totally change her playstyle. I dont think she is highly overpowered, but i do feel like she is at risk for a very high ban rate if nothing changes, considering she is almost ungankable most junglers would not want her in their games.