Alistar, The Minotaur
As the mightiest warrior to ever emerge from the Minotaur tribes of the Great Barrier, Alistar defended his tribe from Valoran's many dangers; that is, until the coming of the Noxian army. Alistar was lured from his village by the machinations of Keiran Darkwill, General Boram Darkwill's youngest son and commander of the Noxian expeditionary force. When Alistar returned, he found his village burning and his family slain. Bellowing with rage, he charged an entire regiment of Noxus' elite, slaughtering them by the hundreds. Only the intervention of some of Noxus' most skilled summoners checked Alistar's rage. Brought in chains to Noxus, Alistar spent the intervening years as a gladiator in the Fleshing, pitted in endless battle for the entertainment of Noxus' wealthy leaders.

Alistar's once noble soul slowly became twisted, and he would have been driven to insanity if not for Ayelia, a young servant girl who befriended him and eventually arranged for his escape. Suddenly free, Alistar joined the newly formed League of Legends to fight as a champion, hoping to one day exact his final vengeance upon Noxus and find the girl who had renewed his hope. Initially unwilling to cater to his celebrity status as a champion, Alistar has since discovered that there is power in fame, and he has become a vocal advocate for those whom the Noxian government treads upon. He also calls to light things that the Noxian military would prefer remain hidden -- something that has made him very unpopular with Noxus' nobles. His charitable work has earned him several philanthropic awards, which serve as an interesting contrast to the rage and destruction he brings to the League of Legends.

If you intend to grab the bull by the horns as a summoner, Alistar might have something to say about that.

Pulverize - Alistar smashes the ground, dealing damage to all nearby enemies and tossing them into the air. On landing, enemies are stunned.
Alistar smashes the ground, dealing 60/105/150/195/240 (+0.5) magic damage and tossing all nearby enemy units into the air, stunning them for 1.5 seconds.
Cost
70/85/100/115/130 Mana
Range 365

Headbutt - Alistar rams a target with his head, dealing damage and knocking the target back.
Alistar charges at an enemy and rams them, dealing 85/130/175/220/265 (+0.7) magic damage and stunning them while knocking them back.
Cost
80/90/100/110/120 Mana
Range 650

Triumphant Roar - Alistar lets out a commanding war cry, restoring health to himself and nearby friendly units for half the amount. Can be cast more often if nearby enemies are dying.
Restores 60/90/120/150/180 (+0.2) health to Alistar and half as much to nearby allies. Cooldown is reduced by 2 seconds each time a nearby enemy unit dies.
Cost
20/30/40/50/60 Mana
Range 575

Unbreakable Will - Alistar lets out a wild roar, gaining bonus damage, removing all crowd-control effects on himself, and reducing incoming physical and magical damage for the duration.
Removes disables from Alistar, and Alistar gains 60/75/90 Attack Damage and takes 50/60/70% reduced physical and magic damage for 7 seconds.
Cost
150 Mana
Range 1

Trample - Each time Alistar casts a spell, he Tramples nearby units for a few seconds, dealing damage to units he walks over.

- Using Pulverize can allow you to establish better positioning for Headbutt.
- Movement speed is very important on Alistar. Consider which boots to buy carefully.
- Using Flash can allow you catch your target off guard to knock them back into your allies with Pulverize and Headbutt.

Well...this is my second build, the 1st one it's from morde: http://www.mobafire.com/league-of-legends/build/huge-mordekaiser-ap-tank-181589

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The thing with this build is to have mana regen from the very beggining, and start with heal. it works great going in lane with a melee carry or AD carry to make a continous heal and support to your partner. Starting with this items will allow u to tank and support in a early game. and with force of nature and the Sunfire u will tank a lot... this works really great. Also, with your passive skill and the sunfire u can make a continous damage to the enemy, and with the cooldown and the high amount of mana regen, u will be always casting something and have the passive active all the time...

Hope u guys like it... RATE IT plz!