Unstoppable Onslaught is a great way to initiate a teamfight as it deals damage and stuns multiple enemies, but you're restricted to a straight line so make sure you can land it.
You can also use Unstoppable Onslaught to ensure Sion escapes from unwinnable battles.
The best combo here is Roar of the Slayer to slow down an enemy, followed by Decimating Smash.
LoL Sion players may find him to be a challenging character to build out properly. You will find that his build varies when he is playing against either generic or specialized team comps, showing you should not take the same Sion build every game of League of Legends
The most critical items to include in your champ's build include: Iceborn Gauntlet, Sunfire Aegis, and Titanic Hydra. Those who added these items in their builds had a much higher win rate than those who worked towards other item builds for Sion. Similarly, if you are fighting a mixed enemy team arrangement, you should really consider grabbing him the Resolve, and Inspiration runes. In recent games, he won the greatest percentage of his rounds when equipped with these runes.
We calculated our Sion build guidance by examining 103,205 recently ranked LoL matches with him in them. We only advise the best winrate Sion builds that have been built by ranked League players enough times for us to advise them. With so many matches in our data, we are confident in our suggested builds.