While Cleanse does not remove the Children of the Grave debuff, a Quicksilver Sash will. You can use the active part of the item to remove the debuff and denying Mordekaiser his pet and kill.
Mordekaiser's pet benefits from the items the respective champion buys. Therefore the respective champion should not buy anything before the pet dies. D:
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The only champions that ever caused me a problem middle lane were Heimerdinger...(9)Cassiopeia....(8)Swain....(7) Bruiser Carry mid- (6) The rest of the ap carry champs range from a 1-5 difficulty; thus 1 being the easiest, 10 the hardest to beat!
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My 80% win ratio with mordekasier proves he is OP!

Q- Very nice when farming; when doing a 1v1 does tons of damage; double!
W- Good item since you are going sorta tank and ap burst! Does about 100+ dmg per sec and 30 magic resist and armor! HELL YEA!
E- Your bread and butter skill to poke...kill...and dominate...use it wisely..when farming get at least 6 creeps...when poking..get caster minions and enemy champ!
R-GG get a clone! You get a clone with this spell and usually aim the ad carry or the tank!
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Remember: ALL OF MORDEKAISERS ABILITIES COST HEALTH; THUS 9 POTS 2 WARDS AND 9% SPELLVAMP QUINTS FIXES THIS PROBLEM! REMEMBER TO FOCUS ON CS!
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Iron Man

35% of the damage dealt from abilities is converted into a temporary absorption shield. Shield generation is only half as effective against minions and monsters. Maximum shield strength is 90 + (30 × level). The shield decays by 3% per second.
Mace of SpadesRANGE: 600COOLDOWN: 8 / 7 / 6 / 5 / 4COST: 25 / 32 / 39 / 46 / 53 health

ACTIVE: Mordekaiser enhances his next attack, converting it to deal magic damage and replacing the base attack damage component with a base amount of damage. He swings his mace with such force that it echoes out, striking up to 3 additional nearby targets.
If the target is alone, the ability deals 65% more damage.
MAGIC DAMAGE: 80 / 110 / 140 / 170 / 200 (+ 40% AP) (+ 100% Bonus AD)
SINGLE TARGET MAGIC DAMAGE: 132 / 181.5 / 231 / 280.5 / 330 (+ 66% AP) (+ 165% Bonus AD)
Creeping DeathRANGE: 750COOLDOWN: 20 / 18 / 16 / 14 / 12COST: 26 / 32 / 38 / 44 / 50 health

ACTIVE: For 6 seconds, Mordekaiser unleashes a protective cloud of metal shards to surround an ally or himself, increasing the target's armor and magic resistance and damaging enemies within 250 range.
MAGIC DAMAGE PER SECOND: 24 / 38 / 52 / 66 / 80 (+ 20% AP)
MAXIMUM MAGIC DAMAGE: 144 / 228 / 312 / 396 / 480 (+ 120% AP)
ARMOR & MAGIC RESIST BONUS: 10 / 15 / 20 / 25 / 30
Siphon of DestructionRANGE: 700COOLDOWN: 6COST: 24 / 36 / 48 / 60 / 72 health

ACTIVE: Mordekaiser afflicts all enemies in a cone in front of him, dealing magic damage.
MAGIC DAMAGE: 70 / 115 / 160 / 205 / 250 (+ 60% AP)
Children of the GraveRANGE: 850COOLDOWN: 120 / 105 / 90COST: No cost

ACTIVE: Mordekaiser deals magic damage to a target enemy champion and curses it for 10 seconds, dealing additional magic damage over time. The damage is equal to a percentage of the target's maximum health. Mordekaiser heals himself for the damage done.
If the target dies while under the effect of the curse, their soul is enslaved as a controllable ghost and will follow Mordekaiser for 30 seconds.
During this time, attack damage, ability power, health and movement speed are adjusted as follows:
Mordekaiser gains 20% of the enslaved champions AP and total AD.
The Ghost keeps his own AP plus 75% of Mordekaiser's AP (without the 20% increase from the ghost)
The Ghost keeps his own AD plus 75% of Mordekaiser's bonus AD (without the 20% increase from the ghost) and a portion of Mordekaiser's base AD. PENDING FOR TEST
The Ghost keeps his own HP plus 15% of Mordekaiser's health. PENDING FOR TEST
The Ghost keeps his base MS plus the bonus MS Mordekaiser gets from his boots.
INITIAL MAGIC DAMAGE: 12% / 14.5% / 17% (+ 2% per 100 AP) of target's maximum health
MAGIC DAMAGE PER SECOND: 1.2% / 1.45% / 1.7% (+ 0.2% per 100 AP) of target's maximum health
TOTAL MAGIC DAMAGE: 24% / 29% / 34% (+ 4% per 100 AP) of target's maximum health
LEASH RANGE: 1125
References
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Play Video

Mordekasiers ult is really nice! If the clone autoattacks it gives you shield! Imagine having a dps carry clone....the penta kill....gg. Always aim the ad carry or ap in fights! Either or! DO NOT WAIST IT on a support unless the support is tanky and can tank towers! :) Play Video

Making plays is very easy with mordekasier...very! When you are getting chased by the enemy when their jungler ganks you poke with e and q and run! Run from bush to bush and when he gets low ult and ignite! In teamfights if you see the ad carry offguard flash ult ignite e w q combo dead! The plays are made.....just remember have wards up before doing something balsy...remember no chasing enemy champs through jungle unless you are fed!

It is op early and late! One of the best passives in the game and to be a pro mordekasier you need to take advantage of this! Always have it up by using your e through walls to golems or wraiths; or the enemy's minions! His passive is like hp....but better! Remember your clone gives you shield too when he auto attacks! USE IT WISELY you can 1v4 if you have the ad carry!

Mordekasier can 1v2 easy....but do not get so happy...you get overconfident and go for a 1v3 and throw games like I do! Woot! Always stick with team and ward...sinceyour cs will be around 200+. Also try to be the tank of your team or the second since of Mordekasiers passive will keep you full hp for the first 2 seconds of the fight; but don't worry! Ult ignite and e the ap carry and shield yourself then q and you are back at full hp with op shield! There is where your thornmail and abyssal come in usefull!

If you see the enemy mid leaving their lane then push the tower! If you poke your enemy hard enough and are good with farm at that moment then gank bot! Remember ask support for pink ward! :)

ALWAYS get a ward mid...you will be winning hard with all that cs and kills...however getting ganked is an auto death unless you can beat their jungler and mid in a 1v2 which is easy if their ap carry is low...ult ignite and e! Dead! Go for jungler! Double!.....this usually happens :).


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Farming is the most important thing in the game! Mordekaiser makes this easy! Poke with your e when minions get low and when the enemy ap carry is near the minion wave! Try to hit all 6 minions with e for best spell vamp usage and shield gain!

Health Seals...basic; good late. Magic pen marks and glyphs to burst down those squishy ap carries early! Spellvamp quints for early sustain= 9% spellvamp at level 1.