Sion isn t a teoretic champ , it need to be played for more than 50+ matches to know how to beat diferent types of players , not because the champ is hard , because is the opposite. the runes , counters , and builds are what you will need , and the least you need to want to play w Sion to know what realy counters your playstyle, this guide is for your first matches , where you need a little bit help with runes and itemisation , and remeber that , to win with Sion , you need to have a little sustain in the back , and you will carry easy with your cc's from R and Q .
Have a nice day I wish i helped you :)