To those that see the above build, that of course is the best setup to end the game with, but that doesn't mean you should ALWAYS BUILD THAT WAY. Read my guide and understand what you should do, not think the above build is what you should have at the end of every game... With that said, hope you all enjoy the changes. A lot of changing and getting rid of old material..... but **** happens. If any of you have questions or think I need to put more information about a topic, PLEASE LET ME KNOW!

Hope it's a good read and enjoy!

This build is mainly to those who are good with tanks. It makes for a good mage/range Tank and can do alot of damage as well as take it in like a *****. I would recommend that if you have him play a few Co-Op V. AI games and get use to the item's that I have listed,but feel free to switch it up :) Also,it requires ALOT of farming and much needed gold of which can sometimes be a problem. (I am working on the rest of the guide,Im new to this :3)

Mordekaiser, the Master of Metal
During the winter solstice, on the darkest day of the year, a being like no other emerged from the forgotten alleyways of Noxus. Standing eight feet tall, and concealed within a razor-sharp armored shell, he came to be known only as Mordekaiser. The nature of what lies beneath his carbonized carapace is a popular subject of speculation. Many allege that he is a mortal man with a heart that has hardened to iron. Others insist that he is a dark specimen of the undead. But there are some who whisper warnings that he is merely a foreshadowing of something terrible and unprecedented yet to come. Despite the public conjecture and curiosity, none have discovered what lies beneath his alloyed exterior. What is known is this: Mordekaiser arrived unannounced at the Institute one day and, with a rasp that crept ice up the spines of all within earshot, requested to join the League of Legends.

Upon glimpsing his fearful visage, most keep their distance, fortunately unaware that his touch bears a sinister scourge. Those who stumble within his grasp fall victim to incurable maladies. In fact, Mordekaiser seems mystically attuned to sickness, as if it feeds and comprises part of his chilling essence. He now stalks the slums of Noxus, drawn to the plague-ridden and diseased. However, there is something in his clever tactics, something in his noble stance, something in the tone of his unearthly commands that has led many to believe that Mordekaiser is more than just a foot soldier. Some see the distinguishing characteristics of a general. While many have learned to accept the evidence of this unsettling possibility, a lingering question keeps them wary at the witching hour: If Mordekaiser is a general, what nightmarish legion lurks at his command?

"The common perception is that the encompassing armor protects him, I fear that -- for the fragile time being -- it actually protects us."

Pros:
can lane against anything
good AOE damage
lane pusher
hard to kill
doesn't use mana
spammable spells

Cons:
no stun or slow
has a rough start (usually)
not very high damage dealer

Order of Skills:
1. (E)-Siphon of Destruction
2. (Q)-Mace of Spades
3. (W)-Creeping Death
4. (E)-Siphon of Destruction
5. (Q)-Mace of Spades
6. (E)-Siphon of Destruction
7. (Q)-Mace of Spades
8. (E)-Siphon of Destruction
9. (W)-Creeping Death
10.(Q)-Mace of Spades
11.(E)-Siphon of Destruction
12.(W)-Creeping Death
13.(Q)-Mace of Spades
14.(W)-Creeping Death
15.(W)-Creeping Death
16.(R)Children of the Grave
17.(R)Children of the Grave
18.(R)Children of the Grave

Iron Man
Amazing in the laning phase and for farming/jungling in the mid-game. Allows you to suck large amounts of harassment and acts as a nice buffer later in the game

Mace of Spades
Short cooldown, moderate damage. It fills your shield and when used in combination with siphon it makes farming minions kills trivial even early in the game.

Creeping Death
This is a powerful, but often overlooked ability. It can be placed on a minion as it runs into battle to safely harass champions and kill minions from afar. It provides a decent armor/magic resist boost to the target and does a large amount of aoe dmg. Its obvious weakness is that it is only a 6 second duration, however with golem it can have a near 100% uptime. This is the bread and butter for this build. It makes you (or a teammate(or a minion)) harder to kill and dangerous to be around.

Siphon of Destruction
Does moderate damage in a decent sized cone, but fills your shield up extra for each target hit. Also a very short coolown. This is your main skill for harassing and for farming as such i recommend maxing it first.

Children of the Grave
I initially felt this was a very weak ultimate, but recently I have begun to appreciate its potential. The tool tip is unclear but you do in fact get a percentage of your victims health when they die. If you use this on the focus target at the outset of a fight you will get the heal and it will negate all the damage you just took as well as boost your stats. You are also very hard to kill in the 8 seconds while it is running. The pet gets such a huge health boost that you can use it to trivially tank a tower while you/your team destroy it, No minion support required.

Summoner Abilities:
Flash is ALWAYS needed to get you out of a tough spot; it usually isn't used for getting kills because Mordekaiser should mostly participate in team fights, but it is amazing at fleeing when you have push a lane too far.
Ignite is Mordekaiser's bread and butter when it comes to his ultimate (Children of the Grave) ability. Since his ultimate doesn't do that much damage, If you use his ultimate it in conjunction with ignite, you will observe some nice low-health-point kills when your enemies are retreating. (can also use Ignite/Exhaust)
If your team doesn't have a teleport, then you should use it instead of ignite. There should always be at least one person on the team with teleport (to protect towers/gank/aid in team fights). For the most part, teleport should be reserved for tower-pushing heroes, well guess what! Mordekaiser is pretty good at pushing towers!

Runes:
Magic penetration runes are amazing with Mordekaiser, but I am the firm believer that you should only use primary runes, so this is how I roll:
RED = magic penatration
YELLOW = Dodge (or +armor)(or +Health Reg.)
BLUE = -cooldown
Quintessence = magic penatration (or + Health Reg.)

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Summoner Spells (Materies)-(Champion 3)
Obviously, you don't need any utility If you are going to play a more Support/Defend role, so I suggest 21 in Defense and 11 in Offence. the main masteries you want are:

Offence:(9)
- Deadliness (1)
- Archmage's Savvy (3)
- Sorcery(4)
- Archaic Knowledge (1)

Defence:(0)

Utility:(19)
- Perseverance(3)
- Good Hands (2)
- Awareness (4)
- Greed (1)
- Meditation (3)
- Quickness (3)
- Blink of an Eye (1)
- Intelligence (3)
- Presence of the Master (1)

If you decide not to get havoc, the extra mastery points are up to you.

Item Build:
"AP Mordekaiser" items:
- Regrowth Pendant (to start)
- Mercury's treads/boots of Mobility (depends on how many slows/disables the other team has)
- Warmog's Armor
- Mejai's Soulstealer
- Rylai's Crystal Scepter
- Lich Bane
- Zhonya's Ring

By the time you get Rylai's Scepter, you should have around 3.5k life. This item build is only useable if you are owning face in your game. Obviously if you're against a rough team, you should get banshee's veil/frozen heart; it really depends on the situation.

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Item Build:
"Tank Mordekaiser" Items:
- Regrowth Pendant (to Start)
- Warmog's Armor
- Trinity Force
- Atma's Impaler
- The Black Cleaver
- The Bloodthirster
- Spirit Visage

Basic Strategy:
As soon as you hit level 5 you should not be afraid of death, since your energy shield will give you enough of a buffer to protect you from ganks/tanking team fights. Your role is to tank, but since you have so much health, the other team will ignore you as a threat; this is where you shine! Mordekaiser is good for pushing towers, however he becomes really useful once he achieves Rylai's Scepter. When pushing towers early game, you want to use your shield (Creeping Death) on creeps right before they are being attacked by the tower. This way, your creep can absorb twice the damage from the tower while you deal significant damage to the tower itself.

Early Game:
Mordekaiser is nothing special until level 3 or 5; so you basically want to last hit as many creeps as possible and save up for your boots/warmogs. If you are laning with a melee hero (especilally jax), it can be very advantageous to use Creeping Death on him before he goes in to deal some damage. You shouldn't lane with a healer, because another lane could use the healer more than you! When you push creeps to the opponent’s tower, you should run into the jungle and kill off some neutral creeps for extra experience.

Mid Game:
This is where the other team starts to think you're a damage-less tank, and you're confusing them with your item build. Right now you should have your boots, Mejai's Soulstealer, and warmogs armor, (and possibly on your way to Rylai's Scepter). If your team is winning, keep pushing lanes and gain experience, but if your team is up for team fights, this is your forte. You shouldn't be ganking heroes by yourself, but you should be the first hero into a team fight. Aim for the squishy heroes (ie Ashe, Ryze, Teempo, etc) with your Ignite and Children of the Grave. Lizard buff works well on you, but it should still be reserved for other heroes that benefit from it more (twitch, shaco, tristrana, etc).

Late Game:
Your hero is pretty much just as powerful in late game as he was in mid game, however you become a lot more usefull. So late game basically starts for you once you get Rylai's Scepter and you can really start messing people up. You should always be the first one into battle, and the last one chasing enemy survivors. With Rylai's Scepter, Children of the Grave is not a bad choice to chasing people down before you kill them, since it's your only skill with decent range, and it can now slow people (with rylai's scepter).

so there is my guide for AP/tank Mordekaiser. This build is favourable to a DPS build because it is much cheaper, and you deal more damage. Let me know what you think; this is my first guide.