Spreading your tentacles around the map is a good strategy. You can then use Harsh Lesson to command all tentacles within range to attack her target.
Use Leap of Faith when there are multiple enemies nearby so that you spawn the max number of tentacles. This can dramatically shift a teamfight because the tentacles deal a lot of damage.
Q: What is Illaoi's greatest strength?
A: Illaoi does great in teamfights. She deals a lot of AoE damage and heals based on the number of enemies hit. She is sometimes more unkillable in teamfights than in 1:1 engagements. She just needs to survive long enough between her tentacle strikes to heal back up again. Including some tank or other HP items in your Illaoi build will help her dominate team combat.
Q: What is Illaoi's greatest weakness?
A: Illaoi's damage and survivability depend on her having tentacles nearby. During the laning phase, these can be knocked out relatively easily by ranged champions. During the roaming phase of the game, she won't often stay long enough in one spot to build up enough tentacles to be terrifying. While her Ult will spawn additional tentacles for each nearby champion, it isn't a sure thing and has a long cooldown.
LoL Illaoi players will find her to be a challenging champ to build out properly. You will see that her build is modified when she is up against either generic or homogenous team comps, showing you should not follow the same Illaoi build every single round of League of Legends
The most essential items to use in your champion's build include: Goredrinker, Sterak's Gage, and Spirit Visage. Players who added these pieces in their builds had a better win rate than those who went for other item builds for Illaoi. Moreover, if you are trying to beat a varied enemy team composition, you should really consider grabbing yourself the Resolve, and Precision runes. In recent games, she won the greatest fraction of her games when using these runes.
We set our Illaoi build suggestions by analyzing 51,753 recently ranked LoL matches with her in them. We only recommend the top winrate Illaoi builds that have been built by ranked League players enough times for us to suggest them. With so many matches in our dataset, we are confident in our suggested builds.