Volcanic Rupture is an excellent skill to disrupt enemy team formations, anticipate where your enemies are positioning and break up their combos with this.
LoL Ornn players could find him to be a difficult champ to build out properly. You will see that his build is modified when he is up against either well-rounded or highly focused team compositions, indicating you should not take the same Ornn build every round of League of Legends
The most essential items to include in your champ's build are: The Unspoken Parasite, Sunfire Aegis, and Warmog's Armor. Players who added these items in their setups had a higher winrate than those who used other Ornn builds. Moreover, if you are playing a well-mixed enemy team composition, you should strongly consider getting yourself the Resolve, and Precision runes. In recent matches, he won the largest fraction of his rounds when built with these runes.
We came up with our Ornn build suggestions by examining 54,178 recently ranked LoL games with him selected. We only advise the highest winrate Ornn builds that were used by ranked League players enough times for us to propose them. With so many rounds in our dataset, we are quite confident in our suggested builds.