Illaoi isn't op, she does not need nerfs, she needs small changes to some abilities.
I have played Illaoi for quite a while and I either pub stomp in lane hard and sometimes dominate teamfights, or I dont do well in lane and rely on the enemy to make mistakes for me to get back in the game(dive me).
Her abilities on their own are fine but the combination makes them a bit absurd. Here are some issues I found with Illaoi.
Her tentacle damage scales too fast, it does not feel right that by leveling up her Q because when she does, her entire kit indirectly gets a lot stronger. I propose that her Q still do this BUT not as hard.
Think of it this way, if currently leveling her Q makes her tentacle damage a 8/10, it should instead at level 9 make it a 5.5/10 but scale all the way to 9/10 or 10/10 to compensate at level 16-18.
Her W is fine imo just could use an indicator when hovering over the skill to show you where the tentacle will slap when hovering over targets.
E for all the slack it gets, needs nothing really done to it except maybe a cooldiwn increase for late game.
R is where Illaoi is strongest, it creates a window of power for her while it is active, why not make Illaoi the actual zone threat juggernaut she is? Why not remove the decreased cd on W while this is active and instead make her ult make an aoe visible to her and the enemy where if any enemy champions are in it, Illaois tentacles damage and healing are reduced to 40 or 50% effectiveness but will non stop slap any champions within as long as Illaoi is inside.
Passive: just a buff for Illaoi, let her be able to come 15 or 20 minutes into the game be able to manually let out the tentacles where she wants as a toggle, either randomly come out or manually. Would help her when shes in the jungle with her team.
Thoughts?