Hi i been playing jarvan IV for a while now trying to find what goes well and i think ive got it.

Basicly the days when i used to play Olaf alot core items were ATmas and frozen mallet and its the same for Jarvan. Hes very tanky but can dish out damage.

I start with dorans blade and aim for mercury treads first after this you need atmas but you also need a hp increase so buy giant belt first.

It says your hp is 1930 at level 18 but its around 3000 so thats wrong.

After you have gotten atmas and frozen mallet this is where you look at how your doing and how the enemy is doing. IF you have no tank you do it the more hp also the more damage you do. IF your doing well maybe go for sword of the divine simply because it gives attack speed 100 bonus magic damage every 4th hit and when activated 30 armor pen and they cant dodge so its pretty effective.

Especially when combined with your ultimate because your auto hitting them. Also when jumping someone with your ultimate plant your e where they will escape and keep auto attacking when the barrier falls then use your Q this way your chance of kill has gone from 50% all the way to 80%.

I put a randuins in the item build but im not 100% sure if it adds reason is your W slows people around by like 35% and so does randuins so add it together its 70% slow but im not totally sure if it adds but i think it does.

I added trinity force because everything from it will help however i have not tried this yet it cud be a good early item. since you use E and your Q does the burst damage sheen mite really affect a fight i will update soon with how effective.

Pros of Jarvan IV

Deals good damage
Soaks up alot of damage
good initiater
good at splitting teams - casters back melee front jump on the casters so melee cant get in.
Great survivability - can escape through walls also
Can jungle from start and great farmer

Cons of Jarvan IV

Can block off teammates
Sometimes difficult to pull off E-Q combo
Can soak up mana fast so blue buff is handy