Osiris The Ass Kicker (S11.2 Solo)

Early Game
Honestly, in early game, you are most likely to suffer. The Bluestone Pendant will keep you alive. But you will have to be patient and farm.
I start with Qin's Sais but if you know what God you will face, then go ahead and start with Phalanx or Shogun's Kusari.

Mid Game
Oh my...
You are starting to deal some good damage. But it is still not enough. Keep in mind that the later, the better. You can easily rotate and do some damage in mid lane. Osiris kit is very powerful and has a lot of control (Stun, HUGE slow, root). But don't forget to farm, the sooner you can upgrade your starter, the better.

Late Game
Now, you finally upgraded your starter, your build is complete. You can deal a lot of damage. I usually pick up one of the Speed Buff with the Purple upgrade.
So it increases your attack speed and it helps you chasing the enemies.
Don't be afraid to run on their squishies. Trust me, you deal a lot of damage compared to what you will take. Save your ult for when they escape. And spread mayhem.

So...
Hope you will enjoy this build ! It is very different from the others I saw about Osiris. But it works very well.
Try it and tell me what you think about it !