the guide could be a bit longer but otherwise it looks quite nice

+1

Three things

1. Why would you go full tank Sion when if you farm well with Enrage maxed first will give you close to the same health at the current point in the game and you will do **** tons of damage which when combined with your ult lets you survive those 3v1s as if you were a tank .

2. Why max your Cryptic Gaze first ever. There are no advantages since the stun duration doesn't incrase, sure the cooldown goes down but if you are spamming your stun and not building AP Sion you will be out of mana almost always. If you really want to go super tank then max Death's Caress.

3. Your guide has no information as to why anyone should play tank Sion. And the fact that you copy pasted your introduction over and over to get the word requirement is the sign that you either don't want to make a full guide and just post builds with no information or you don't understand how to play Sion against anything but bots.