Because of Sion's K/D/A and utility, he has a fairly average overall win rate. He does best in the early game, with a winrate of 53.5% in that phase. Unfortunately, he does terribly in the late game, where Sion's winrate is 48.3%., The difference between his best and worst game phases is about 5.2%. This large difference makes it clear that his power spikes and wanes in different phases of the game. Plan accordingly.
Sion has been picked somewhat often in the latest ranked League of Legends games. In the current meta, his popularity is 5.5%. Hardly anyone sees him as a danger. He has only been banned in roughly 2.6% of League games.
You can see him typically played in the top position. However, that is not the best position for him. The best win rate position for Sion is middle (52,3%). At this time, Sion's meta game is focused on tanking. Specifically, his gameplay should primarily be focused on shielding carries. Additionally, he is an ok physical damage dealer champion. Dealing magical damage is the least critical part of Sion’s build.
If you are not comfortable with his skills and gameplay, you may find it difficult trying him out for the first time. Most competitors believe him to not be a difficult champion to get good at. Sion mostly deals physical damage (57% of his total damage). He also deals a significant amount of magic damage.
Sion deals tons of damage in a typical round (22.676 damage). You should focus on developing him as a powerful champ to smash your opponents.
If you are looking for a dominating damage dealer, then you should maybe consider this champion. He has one of the top kill totals in League amongst all champions. Furthermore, he has a relatively high average champion death count (6.5 deaths). Moreover, Sion's KDA is usually very low with an average KDA ratio of 1.7 as well as 6.7 assists per round.
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