Snot of Izanagi

Swift as the Summer Storm is quite good passive. You can use all your three basic spells in base to get the speed boost without mana cost and get little faster to your lane or jungle. Also, because you want to spam your spells as much as possible, your passive will almost always be active, so you will have some movement speed to chase down enemy. Also, you can use it to escape by spamming spells in the air if you have enough mana.

Storm Kata is the main source of Susano's dmg. Max this out first. Remember that the dash doesn't deal damage. Also, I feel like I should probably mention this, even though the god reveal suggests maxing this out first, the actual in-game auto-skills build is maxing this as the last spell. Don't use it. Ever.

Wind Siphon is by default auto-skills build maxed out first but it's actually only supporting spell that allows you to close the distance between you and your enemy so you can use Storm Kata to deal some actual damage.

Jet Stream is what you want to max this out right after Storm Kata to increase damage and mainly to lower the cooldown and gain more mobility. You can use this to get close to your enemy or to escape but be careful, the skillshot can't go through walls and it will stick to the first enemy hit, including minions. You can teleport even if you hit nothing but only after it stops moving. Also, don't teleport right after you hit an enemy you are fighting right now like an idiot, wait for him to run away so you can finish him up.

Typhoon doesn't deal much damage but it's really hard to get out of it without some escape ability which makes this really good spell. You can easily lock the entire enemy team in it. And don't underestimate the knock-up, it's really deadly in team fights or even in duels. Don't forget to look the way you want it to fire and don't be afraid to releasing it before it is fully charged if you need to.

Cooldown reduction, with amazing abilities like this, you will want cooldown reduction. That's why you want to build Jotunn's Wrath first right after Warrior Tabi. Then you will want to get Transcendence to get it fully stacked as soon as you can. This will give you a lot of power and allow you to spam your spells more frequently. After this you can get any of these. Breastplate of Valor will max out your cooldown reduction, give you tons of physical protection and some mana so you can spam your spells even more. Also, with Transcendence's passive, you will get 9 power. How cool is that? Bulwark of Hope will give you tons of magic protection, some health, CCR and cool passive that will save your life dozens of times. Titan's Bane will allow you to deal more damage and chance to kill those evil guardians.

This is my first build so I don't really know what else should I write here. Also Susano was released today so I don't really understand all of his potential. I will try to update this guide later on.

Also about the skills, for some reason there is no ult in the builder yet so that's why it's missing. Simply replace the empty spots with ult.