Thanks to 질리언's K/D/A and utility, he has a fairly average overall win rate. He does very well in the mid game, with a winrate of 52% in that phase. Unfortunately, he does worst in the early game, where 질리언's win rate is 48.2%., The difference between his best and worst game phases is about 3.8%. This sizeable difference indicates that his power spikes and wanes in different parts of the match. Prepare accordingly.
In the current meta, 질리언 is not very popular. He has been selected in only 2.2% of recently ranked matches. He is rarely banned during champ select. Obviously, very few players see him as a major threat. In recent ranked rounds, 질리언 was banned 0.6% of the time.
질리언 is played mostly in the support position. This happens in 89.7% of his matches. Yet, support 질리언 has the highest win rate (51.6%) of all positions but is less popular of a position (played 8.2% of the time). Currently, 질리언's meta game is focused on dealing damage. In particular, his gameplay should mainly be focused on magical damage. Furthermore, he is a decent tank champ. Dealing physical damage is the least important part of 질리언’s playstyle.
If you are not comfortable with his skills and gameplay, you may find it difficult trying him out for the first time. Many players believe him to not be a challenging champion to get good at. 질리언 primarily deals magic damage (85% of his total damage). He doesn't deal a lot of other damage types and should not be played as hybrid damage dealer..
질리언 deals only a little damage over the course of a regular ranked round (11,482 damage). You shouldn't focus on developing him as a powerful champ to smash your enemies. Instead, players should focus on helping your teammates to win.
If you are looking for a dominating damage dealer, then you should definitely not consider this champion. He has one of the lowest kill rates in League amongst other champs. Additionally, he has a relatively typical average champion death rate (5 deaths). Furthermore, 질리언's KDA is usually very high with an average KDA ratio of 3.2 as well as 13.4 assists per match.
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