Hello and welcome to my very first build on Mobafire! This is my Attack Damage/Attack Speed build for Jarvan, truly the best one out there I have seen thus far. I will try to go into as much depth as I can, I am sorry if I leave anything out as this is my first guide, I will do my absolute best :)
You can talk to me in-game as my mobafire name is the same as my in-game name!
Leave comments and constructive criticism below :D

-Jarvan IV
-Common sense
-Reaction Time
-Be able to land almost all skill shots
-Be able to fight in any situation/know the terrain
-Have map awareness, this is KEY
-The drive to have fun :D

Pros:
-VERY good farmer
-Team Battle Support
-Domination of any lane
-Able to escape easily
-Ganks anything
Cons:
-Thornmail owns you
-Runs out of mana quickly at beginning
-Weak until mid game
-LOW LOW LOW magic resistance - be careful!

Martial Cadence: (Passive)Jarvan IV's first attack on his target deals 8% of the target's current health as bonus magic damage, caps at 400 damage. This effect cannot occur on the same target for 6 seconds.

Dragon Strike: Jarvan IV extends his lance/spear in a straight line dealing 70 / 120 / 170 / 220 / 270 (+1.10 per bonus attack damage) physical damage and lowering their armor by 10 / 14 / 18 / 22 / 26% for 3 seconds. When this hits your standard, it pulls your towards it, knocking up any enemies in the way.

Golden Aegis: Jarvan IV forges a shield protecting him 50 / 100 / 150 / 200 / 250 (+20/25/30/35/40 per nearby enemy champion) damage for 5 seconds and applying a 15 / 20 / 25 / 30 / 35% slow to surrounding enemies upon activation.

Demacian Standard:
(Passive): Grants Jarvan 10 / 14 / 18 / 22 / 26% bonus attack speed and 10 / 14 / 18 / 22 / 26 armor.
(Active): Jarvan IV throws a Demacian flag to a nearby area, dealing 60 / 110 / 160 / 210 / 260 (+0.80 per ability power) magic damage to enemies in the area and granting his passive benefits to nearby allies and again to himself for 8 seconds.

Cataclysm: Jarvan IV heroically leaps to an enemy champion, dealing 200 / 350 / 500 (+1.50 per bonus attack damage) physical damage and creating a circle of impassable terrain around them for a 3.5 second duration. Jarvan IV can destroy the area by activating it again. Champions can still leave or enter the area by using teleport abilities.

Dragon Strike is your most important ability for the overall outcome of Jarvan. When laning, ALWAYS kill the minions to increase warmogs and to obtain gold for buying items. The spear usually takes out MOST of the health of minions, so combine it with Demacian Standard to get last hit. The reason you should use the standard second is so that you do not get pulled toward your enemies.
When in team fights, Dragon Strike is also IMPORTANT! When it hits, it decreases their armor by a percentage, letting tanks wide open for you to destroy :D

Demacian Standard is your second most important skill which allows you to control team fights, or turn them in your favor. When you place your standard, is gives your team Demacian Standard's passive, allowing your team hit much faster, getting you that winning 50 health lead :D

Cataclysm is probably your third most important skill, even though it's usually only used for escaping champions or initiating team fights. Just make sure NOT to trap your allies outside, I've done this many times and cost us the team fight. Still mastering it myself yet :D

Golden Aegis This is probably equally as important as Cataclysm, but I put it in forth because it only supplies a small shield and a slow. I personally use this as a 3rd spell when initiating a fight so Demacian Standard-- >> Dragon Strike-->> Golden Aegis forcefully inserting yourself (that's what she said?:D ) and letting you escape using the same combo.

When escaping or chasing, make SURE to ALWAYS jump over walls and cliffs using the Demacian Standard-- >> Dragon Strike combo to fly right through them!

Greater Mark of Attack Damage For attack damage you need at the beginning, adding damage onto your Dragon Strike for early kills.

Greater Mark of Attack Damage for just a tad bit extra health so you can an early gank/2v2 team fight.

Greater Seal of Magic Resist for magic resistance, this character for some odd reason has very low magic resistance.

Greater Glyph of Attack Speed for that attack speed you need =)

Greater Quintessence of Desolation for armor penetration, pretty much makes you a tank buster after you take into account your Dragon Strike.

I'm the guy in the game who always uses Ignite and Teleport. It's my favorite combination of spells out there. Teleport let's me get a dieing turret, or gank a noob through a sight ward. Ignite let's me kill the people escaping or prohibit characters like warwick, nunu, sona, from healing as much.

Ignite This does 50 true damage and reduces healing by 50%. Use this to kill 2v2 battles at the beginning when side laning or to kill escapers.

Teleport Let's you get anywhere and fast

Ghost Let's you escape or catch, don't personally like but works well

Exhaust Slows enemy attack speed and movement speed. Don't see the point when you can already slow and trap, but some find it useful.

Manamune is for the attack damage/Mana combo you need. Never sell this bad boy, you will lose A LOT of needed mana.

This is for movement and attack speed. This basically gives you enough attack speed/damage output until you get Black Cleaver

Warmog's makes you the tank Jarvan is meant to be. With one hit killing minions with Dragon Strike, you max it out in no time.

Bloodthirster: Attack damage and life steal. OP champion much?

Black Cleaver: For that last attack speed you need. Gets you to about 1.5 attacks/second. Combine this with 300 damage and you've won.

This is a SITUATIONAL item! I ONLY ONLY ONLY use it when facing more then one tank or one really high hitpoint champion. I usually exchange it for Banshee's Veil or Guardian Angel depending on the situation. I haven't used him enough to know every item this 6th item slot could use, so I suggest trying something of your own fun.

Okay so the first three item's are the same as before so you set yourself up for late game domination.

Now the additions:

Frozen Mallet This adds onto your health currently with attack damage. This provides an extra slow when you hit with your Dragon Strike or Golden Aegis to be able to catch up to them or allow the team to catch up to you incase you Golden Aegis-->> Dragon Strike combo an opponent.

Black Cleaver will do the same as before, adding attack speed and damage

Atma's Impaler Now this is a very good idea, I haven't fully incorpetated it into my build yet but basically what it does is that it takes your massive health and converts it into attack damage. Along with the extra health from [[Frozen Mallet] it becomes a deadly combo and a very high hitting character.

Right away when you start the game, buy a long sword and Health potion. You should try to wait until LEVEL SIX until you go home and buy components for Manamune.

After that item set is complete, you should buy boots for speed then upgrade to Berserker's Greaves.

Then proceed to buy the Giant's Belt and work your way up to Warmog's Armor.

To get the attack damage and life steal, start with a Vampyric Scepter and upgrade to blood thirster

Finally get Black Cleaver to finish off the build.

The last item should be situational. It depends on who is controlling the game and what champions you are facing. Choose wisely.

Honestly, Jarvan can hold anything by himself, even mid. If you want to fight a 2v1 while your partner jungles, by all means go ahead. Soloing a side lane by your self is extremely effective... that is if you aren't to greedy like me sometimes :D

Solo
Remember that Jarvan doesn't have much magic resistance, so do NOT get caught in a lane with a character such as ashe or karthus. Always stay back and turret hug because you do not have a ranged spell. Tend to stay back far behind minions, and when the enemies come up to attack, poke them with your spear. Usually they get cocky enough to charge and you shield up, Dragon strike, and Standard them for the kill. Don't forget that Ignite :D

Co-Op
I personally like laning with a character then can also stun, slow, or suppress so that I can get a little damage off before they have a chance to move. Never get over aggressive, using your Dragon Strike range to kill those enemies at the turret.

Jarvan IV is meant to be a tank/figher. So play him like one. Get him a set or warmog's and black cleavers. I mean come on, who could withstand such awesomeness?

Remember: Demacian Standard -->> Dragon Strike knocks up enemies caught in the way. Use it to escape or chase. DO NOT get caught using the flag and miss-clicking yourself into a turret. I've died many times this way.

Dragon Strike -->> Demacian Standard combo to kill minions.

Weakness: Try to target magic output characters FIRST or stay away from them. Jarvan has a severe weakness to them in this build.

Use Cataclysmic to start team fights or to cut off a powerful enemy from the rest.

Here's a few of my wins:

March 10, 2011: Build Created
March 12, 2011: Item updated build created