Let's get straight to the point, shall we? Mordekaiser The Master Of Metal is one of the undervalued gems of the tanks in League of Legends due his ability to dish out loads of damage, while soaking up damage for your team. He has a great ability to turn fights around using Children of the Grave, and even shielding teamates at higher levels using Creeping Death. While people may not classify him as a tank due to his evident lack of crowd control, his ability to "take one for the team" accounts for this, though I would not use him as a tank when your team lacks crowd control. He is a great complement to most teams and is quite versitile, and that is why I have making this guide to help those out there acheive Legendary status using this tank! I have gotten many legendary status' with him and good scores (I am sorry I could not upload pictures, but i have screenshots but I lack the knowledge of how to upload...but these were all scores is got in a 20 wins streak with this build), such as:
- 11/1/10
- 14/1/24
- 11/1/12
- 6/0/9
- 7/0/15
[As you can see, I'm not the best player but i still get good scores]

Positives:

- Is able to soak up loads of damage
- Can dih out loads of damage
- Good at escaping ganks or helping teamates on low health
- Able to turn fights around quickly with his Children Of the Grave

Negatives:

- Can be shut down against heavy magic resistance teams
- Has no crowd control to help teamates
- Is quite item dependant

Marks:

As all you abilities do magic damage, you want to get this magic penentration so you can do that kittle bit more damage in the laning phase, and make sure you keep your shield up from the damage harassment.

Seals:

I go for health per level marks to just increase that edge over your opponents, especially with all the health you will have from warmogs, and these are just to improve your late game unlike the other runes.

Glyphs:

And more magic penetration of course! As keeping your shield up is one of the most integral parts of laning with Mordekaiser, this will help you do that damage and make your harassment more effective.

Quintessences:

This is the only rune type that I take flat magic penetration. This is because all of Mord's abilities do magic damage and so this gives you a little bit of an edge when harassing in the lane, especially when combined with sorcerers shoes early in the game.

As I tend to build Mord quite tanky but with a slight offensive edge, I tend to get most of the generic defensive masteries, and only get four ranks in Evasion as I dont wan to waste the points on anything else while still getting down to Tenacity. I pick up both Sorcery and Archaic Knowledge for the cooldown and magic penetration repectively, as Mords abilites are well complemented with being almost spammable and doing that little extra damage. I dont pick up the point in ingite as the extra Ap is practically useless for him even in the early game.

Flash:

I tend to get this over ghost as I like being able to quickly catch up with enemies or escape ganks by flashing through walls, but it is really only personal preference, and for most players I would reccomend ghost due to the offensive and defensive capability. I would still reccomend having an escape because Mord's ability to do this is practically nill, though his passive (below) does help you escape ganks without dying.

Ignite:

This is great to use in conjuction with your ultimate as it is great for getting kills on those people you cant chase or just to ensure the kill. I sometimes swap this out for teleport as I like the mobility and map control it gives, but only take this if you need to or have a desparate internal desire to do so.

Mace Of Spades(Q):

On next hit, Mordekaiser swings his mace with such force that it echoes out, striking up to 3 additional nearby targets, dealing magic damage. If the target is alone, the ability deals 75% more damage.
This is not Mord's best ability but is very usefull in 1v1's in the early stages and can even be used to harass or to clear lanes in combination with Creeping Death and Siphon Of Destruction. I just activiate it as soon as I am in the middle of team fights and bash on the squishies.

Creeping Death(W):

Mordekaiser damages enemies in a cone in front of him, dealing magic damage. For each unit hit, Mordekaiser's shield absorbs additional health.
This is your main damage ability for use in the lane and in the late game, especailly when you have your Void Staff and magic penetration. It is great for harassing targets during the laning phase to keep them off the minions, and also for killing that low health enemy fleeing just out of melee range. Dont hesitate to spam this as it comes at a very low health cost and is on a short cooldown. I get the first point in this nearly always due to the consistent damage output and harassment ability, and I max it out with Creeping Death.

Children of The Grave(R):

Mordekaiser deals damage to the target and curses at it for 10 seconds, stealing life. Damage is equal to a percentage of the target's maximum health. If the target dies while under the effect of the curse, their soul is enslaved and will follow Mordekaiser for 30 seconds.During this time, Mordekaiser gains 20% of their ability power and attack damage. The spirit gains 75% of Mordekaiser's adjusted damage, ability power, and health totals.
This is the ability that really allows Mordkasier to tank for the team and push towers. The ghost is great for taking tower damage or helping you kill people, and you can really turn fights around by getting a ghost as the damage it does conrtibutes to your shield, and so you can continue to tank it out even on low health. In the early and even late game, if there is an enemy on low health, pop your ultimate and ignite on the target and the dot is usually sure to kill it unless they have large amounts of healing. Remember when you have the ghost, use Alt+ right click to control it. I often see people being really hesitant with using this ability when they think they wont get the kill, but always pop this in teamfights as a ghost is always helpfull even if you dont get the kill on your record. If it is a 1v1, you can use it earlier before you are sure they are dead for the lifesteal, as you will most likely do enough damage for the dot to kill them.

Iron Man (Passive):

25 / 27.5 / 30% of the damage dealt from abilities is converted into a temporary shield, absorbing incoming damage. Maximum shield strength is 90 + (30 x level). The shield decays by 3% per second.
I'm sorry that I did not mention this first but I wanted to give you an idea of the various other skills before going onto this. This is the skill that really makes Mord. It is really easy to build it up, and in the laning phase it protects against harassment and helps to not die from ganks. And the great thing is that you can put out your own harassment with Creeping Death and Siphon of Destruction while charging it AND thus not taking much damage. In the later game his damage output from his abilities with Rabadons allows you to have an extra bar of health to absorb damage een before they get to massive amounts of your true health. It is also great for turret diving and tanking turret damage for your team, as that usually happens when you have been killing people.

Doran's Shield:

This is probrably the best starting item for Mord due to the extra health and regen that you need to keep in the lane. The armour also helps in the early phase.

Sorcerer's Shoes:

Many people may be tempted to get Ninja Tabi instead of this, but for me as soon as I get these during the lane my damage output and harassment abilites goes up dramatically. Also in these early stages, you really dont need armour or resistence due to your runes.

Warmog's Armour:

I nearly always get this item first if I am tanking as you need time to farm up the stacks and the number one rule with tanks is always to get health before armour/magic res otherwise you cant survive. The regen with the health is also good for Mord as you can use your abilites without fear of losing too much health through the cost. Many people often say "Oh no never get warmogs first...thats the way to fail" or other such things like that, but I have won nearly every game building like this as you just have so much health that you don't have to worry about resistances for a while (until you can get thornmail). Don't rage at me for this as I have just found that it works for me, but you are always free to get a FON first if you REALLY want to....

Force Of Nature:

This is another core item for Mord as it gives you really good magic resistence as well as boosting your regen which is always helpfull. As is it relatively expensive, I tend to get the negatron cloak when I can to ensure the magic resistence is brought to the character as soon as possible. The movement speed also helps you catch up to those pesky enemies running away, or even running away yourself.

Thornmail:

This is the item to complete your "trifector" of tanking, as it essentially shuts down all dps champions and gives you lots of armour. As soon as you get these three items, you should be pretty hard to kill in total, and your team will start dishing out the damage without getting too damaged themselves. Remember that you can get these items in different orders depending on the team compostion, and always get Thornmail for heavy dps and FON for heavy caster teams. This is where the majority of you teankineess comes from and so once you have got these you can start increasing you damage output.

Rylai's Crystal Septer:

The extra health and attack damage always helps, and this is a great item for Mord as it allows him to focus on an enemy and accounts for his lack of crowd control. I get this in the late game so you can proc it on multipule people in a team fight to control their movement to allow you team to focuss them down. It is great as it gives you that needed ability power but also allows you to chase effectivel using your siphon/creeping death combo. You can swap this out for Randuin's Omen as the active from that can also be really usefull in a team fight.

Void Staff:

This is a great item to round off the build for Mord. It may not give you as much ap as Rabbadons or other items, but the 40% magic penetration boost will make your spells very dangerous when combined with not only your almost 20% magic pen runes but also Sorcerers shoes. This means that you completely run over enemy teams who are stupid enough not to get magic resistance.

Remeber that the order of these items and the actual items themselves are quite subjective, and ALWAYS modify your build according to the enemy team.

In the laning phase you want to be quite agressive with both your Siphon and Creeping Death to harass the enemy, and make sure to keep your shield up to mitigate enemy harassment. You generally want to keep Creeping Death on whenever you can to keep your resistances up, and remember to help teammates escape or survive, or put it on a melee dps in your lane so they can do extra damage when going in for the kill. Always remeber to pop your ulti when they are on low health, adn with ignite, even whe they are running under the turret as the damage from it should intially counter turret damage while you run out of range and the ghost will spawn at you when they do die so you dont have to look at two places at once. Whenever in teamfights, you want to out your creeping death on as soon as you engadge to the increased armour/magic resist, and then open with Siphon to soften them up. Activate Mace Of Spades while auto attacking someone, and remember to use your ulti on low health enemies running away to get the kill, and pop it on those being focussed (especailly the dps) even if you won't get a kill (just an assist) as it can REALLY help your team. Remember that your job is to soak up the damage for your team and dish out some damage, and if you get fed in the late game you can often take 3v1 as you are tanky enough to get a ghost, and KILL THEM ALL :p!! You know, you could always get a kill and even if it seems undoable, NEVER SAY NEVER; everything is always possible, maybe if not probable.

Pushing:

When trying to push a lane, there are two main options with Mord depending on who you are with or the situation. Mord is really goos at pushing minions, so if you cant tank turret damage AND that of enemy champions, don't hesitate to go back to your minion wave to push it to the tower or even just to clear a lane that is getting dangerously close to your tower. If you are tanky enough and you are with some dps characters, just tank the turret damage but remember that if you have Crreping Death on or a ghost attacking the enemy champions you will draw turret agro.

Farming:

When you are by yourself farming, dont hestitate to stand in the middle of the creep wave with Creeping death on, and use your Siphon and Mace of Spades to kill the minions. The good thing about this is that even if you get ganked, your shield will most likely be up and so you can tank a little more damage from opposition players.

I will apologise now if this build may have seemed boring to those of you with an already good game knowledge but I wanted to make a comprehensive guide for those players who are new to the game, or even just those looking for a good Mordekaiser build and guide. If you follow the guide and are doing well, you should be feeling awsome or unstoppable, as that is essentially all that Mordekasier The Master Of Metal is; BADASS!!!!