Sion is a very easy but hard to learn champion, let me explain. His kit is very easy,q is stun, w is shiled, e is slow, r is beeing fast and stun right after and passive is literally a second life. But sion is more than that. His q is not easy to hit, it charges very long and it dont need to hit for full dmg. You need to know when the charge is ending and when you should use your q. Mostly in situations when enemy is slowed/stunned. Your w, no matter anyone says, the biggest aspect of sion. If you can farm enough stacks, you can be very tanky and hard to kill, i m not saying that your w is just that, your shield can be a good aspect too. It can save your life in many situations. Your e isnt the best ability but it sure is valuable for you. It can slow enmies for you and get an easy q hit. It doesnt do much more but it is good if you use it on minions in a direction of your enemy for allmost guaranted hit. Your r is very op in this season, try to not use is close range(i will explain it in a second). Do not use it to get to your tower until your enemy is there. Most people dont hear the r music(yes it has one idk why) and dont run away. Use it as far as you can(mostly near the 2 tower) after using it go right into your enemy, it should kill every minion under tower and stun them foe enough time for you to use max charged q. This combo lets you place your opponents right under your turret with no minions nearby. If you want to use your r nearby its in very risky situasions. If yasuo is near you can use it for easy combo(you r, yas r and you qfull) or even if your jg(somehow) ganks you. Its all have fun playing sion