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 may find him to be a dynamic champ to build out properly. You'll notice that his build is modified when he is playing against either well-rounded or homogenous team comps, indicating you should not select the same Ornn build every single round of League of Legends
The best items to incorporate into your champion's build are: The Unspoken Parasite, Gargoyle Stoneplate, and Abyssal Mask. Those who included these items in their kits had a higher winrate than those who worked towards other Ornn builds. Similarly, if you are battling a varied enemy team composition, you should really consider grabbing Ornn the Resolve, and Inspiration runes. In recent games, he won the largest fraction of his matches when built with these runes.
We came up with our Ornn build suggestions by examining 44,523 recently ranked League of Legends games with him in them. We only recommend the top winrate Ornn builds that were built by ranked LoL players enough times for us to suggest them. With so many matches in our dataset, we are very confident in our suggested builds.