To Cowstep:

I know that these items are very good and give Jarvan IV some very good stats but, starting with The Bloodthirster, it gives you a lot of damage, giving Jarvan IV the damage he needs to be and offtank. The Warmog´s Armor is also very good as I need the health for the Atma´s Impaler and the health regen for more durability in lane. Although the items you mentioned are very good I really think that I´m staying with the items I already said. Thanks for commenting about it.

I would highly recommend to build Heart of Gold into a Randuin's Omen and replace Bloodthirster with it because its active effect is so strong and synergises very well with Jarvan's Golden Aegis. I would also recommend to switch out Warmog's Armor with either a Last Whisper or a Shurelya's Battlesong for the damage or the mobility.

That's just my tips, you dont have to listen to them. Well written guide otherwise, may need to be a WIP.

@87alphaone I guess it's probably because 0.5% is a little more than people think. People think that it's better to replace that item with something else like a Trinity Force or a Guardian Angel.

@Simplifyx
I still dont understand why ppl dont like Atma's Impaler anymore. I made a little research for my guide, but I will copy it here...so I quote myself:

Atma was nerfed like 2-3 months ago and in my guide the values are correct. However, why you should not use it?

Math time:

Lets start with B. F. Sword which is worth 1650 gold and gives 45 AD. That means 1 point of AD is worth 36,7 golds.

Atma's Impaler is made from 2 items:

• Chain Vest worth 700 golds
• Cloak of Agility worth 830 gold

Recipe price is 825 golds.

Now. Atma's Impaler gives 1,5% of total HPs as bonus AD. That is 15 AD for every 1000 HPs you have.

If you take the price for 1 point of AD (=36,7 golds) and a recipe price (which is actualy the price of the passive) and count how many bonus AD points you need to pay it off:

825 gold / 36,7 gold per AD point = 22,5 bonus AD

22,5 AD / 15 AD (bonus per 1K of HPs) = 1,5K HPs

So the solution. If you have at least 1500 HPs, Atma's Impaler Passive is worth its price and you will DEFFINITELY have more than this (3K cca = my Jax guide), so I dont see any reason why not to use it.

hope you show my diana guide

Okay so first of all, this guide is way too short, no offense, but there can be a lot more information put into this guide.
1. Recommended summoner spells, for example, Flash over Teleport if they don't want full map control but would rather have a spell for escape/catching up/generally helpful in lane.
2. Alternate items, some people choose to use other items instead of Atma's Impaler since there was a nerf on it. Explain your choices as well. Ex: Warmog's Armor earlier than Frozen Mallet because you want the stacks on it ASAP, but you can get a Phage early if winning lane/have high cs and/or gold.
3. Alternate Masteries Maybe? Not sure about it since I don't really play Jarvan, but some people prefer the Armor pen in the offense tree.
4. Runes are too big, consider making them a lot smaller to make it easier on the eyes. Fix your Greater Mark of Attack Damage spelling in the Runes section.
5. Upload some pictures and put it into your guide. Ex: Screenshot your mastery page, upload it, and link it in your masteries section so it looks more colorful and to show people what your masteries are even though it is at the top.
6. Add a Pro/Cons section so people can tell which team comps they should play Jarvan in, and/or not play Jarvan.
7. Make a section explaining abilities and combos that are possible. Ex: Demacian Standard -> Dragon Strike for knock up, and if they Flash, follow up with a Cataclysm, something like that.

Yeahh, so you can fix those first if you want, completely optional. This is only some constructive criticism. Message me if you have done some things to your guide or if you need some help. Good luck.