This is my first guide and im not very articulate with my words so in essences this is a guide in progress ill add more late........maybe

This build is with the intention you use alistars ultimate often. I have used this build in multiple games and when you are at the full build you take no damage from magic or physical.

Some problems with the build is you will do no damage and have poor mana regen for the most part.

The intention is that you are a punching bag.

Thornmail is an optional item and can be interchangeable as you see fit.

With this build you will take no damage from viktor with 900+AP or even a 5 man team fight with a turret (as long as your ultimate is popped) Even without the ultimate you are pretty buff.

Normally i'm in a lane with another preferably ranged.

What I do at level one is hide in the enemy bushes at the very edge with the ranged.

If the enemy is dumb enough to walk into it without sending a projectile in you are almost guaranteed an early gank and first blood.

If not you can normally do the same thing at level 2.

At level 2 what you can do is what I call the Magic Cow Dive.

You flash by the target knocking them in the air at which point you quickly get behind them, when you are at an acceptable position you charge and knock them back to where your turret or ally is.

In late game being focused is your goal. You want all the enemies to be targeting you.

After warmog you can begin to tank turrets. without using your ultimate it will be pressing it. However if you pop your ulti and tank the turret you will take very very small amounts of Damage.

After you get force of nature you will literally take no damage no matter how high or sneaky their attacks are. This is of course considered that you have popped your ult.

As I keep repeating the idea of invincible cow mode is that you have your ulti popped and your allies are with you.

The minute your ulti is down you are still pretty tanky but id recommend running or getting to a safe spot.