Let me start off by saying playing as Jayce is not a walk in the park, at first look he might look the that way. But you would be miss lead by that.I like to build Jayce as high damage and high crit champion. Jayce is unique because he dose not just have the four skills he as seven of them. Jayce is able to use his ult right off the start which lets him change between his Mercury cannon and Mercury Hammer, if you do not know this all ready Jayce Mercury cannon is ranged weapon, where his Mercury Hammer is a melee weapon. Which makes Jayce deadly at any range.
Here is a over view of all Jayce skills:
 Hextech Capacitor | (Innate): Jayce gains 40 movement speed for 1.25 seconds and ignores unit collision each time Transform is cast. |
 To the Skies! | (Active): Jayce leaps to an enemy, dealing physical damage to his target and to enemies in the area, slowing them for 2 seconds. |
Cost: 40 / 45 / 50 / 55 / 60 mana
Cooldown: 16 / 14 / 12 / 10 / 8seconds
Physical Damage: 20 / 65 / 110 / 155 / 200 (+1.0 per bonus attack damage)
Slow: 30 / 35 / 40 / 45 / 50 %
|
 Shock Blast | (Active): Fires an orb of electricity that detonates upon hitting an enemy or reaching the end of its path, dealing magic damage to all enemies in the area of the explosion.
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Cost: 55 / 60 / 65 / 70 / 75 mana
Physical Damage: 60 / 115 / 170 / 225 / 280 (+1.2 per bonus attack damage)
Accelerated Physical Damage:84 / 161 / 238 / 315 / 392 (+1.68 per bonus attack damage)
|
 Lightning Field | (Passive): Jayce regenerates mana each time he strikes an enemy while in Hammer Stance.
(Active): Creates an electric aura, dealing magic damage over 4 seconds to nearby enemies.
- Cost: 40 mana
- Cooldown: 10 seconds
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Mana per hit: 6 / 8 / 10 / 12 / 14
Magic Damage: 100 / 170 / 240 / 310 / 380 (+1.0 per ability power)
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 Hyper Charge | (Active): Jayce gains a burst of energy, increasing his attack speed to maximum for 3 attacks. These attacks deal varied damage depending on rank.
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Cooldown: 14 / 12 / 10 / 8 / 6seconds
Damage: 70 / 85 / 100 / 115 / 130%
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 Thundering Blow | (Active): Deals magic damage equal to a base amount plus a percentage of the target's maximum health, knocking the target back a short distance. This damage is capped against monsters.
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Cooldown: 14 / 13 / 12 / 11 / 10seconds
Magic Damage: 40 / 70 / 100 / 130 / 160 (+1.0 per bonus attack damage)
Max Health to Damage Ratio: 8 / 11 / 14 / 17 / 20 %
Max Damage to Monsters: 200 / 300 / 400 / 500 / 600
|
 Acceleration Gate | (Active): Deploys an Acceleration Gate for 4 seconds, increasing the movement speed of all allies who pass through it for 3 seconds. This bonus fades over the duration.
If Shock Blast is fired through the gate, the missile speed and range will be increased, and its damage will increase by 40%.
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Cooldown: 14 / 13 / 12 / 11 / 10seconds
Bonus Movement Speed: 30 / 35 / 40 / 45 / 50 %
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 Transform: Mercury Cannon | (Active): Transforms the Mercury Hammer into the Mercury Cannon, gaining new abilities and ranged attacks.
The next attack in Cannon Stance reduces the enemy's armor and magic resist for 5 seconds.
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Armor and Magic Resist Reduction: 10 / 15 / 20 / 25 %
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 Transform: Mercury Hammer | Transforms the Mercury Cannon into the Mercury Hammer, gaining new abilities and bonus armor and magic resist.
The next attack in Hammer Stance deals additional magic damage.
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Bonus Armor and Magic Resist:5 / 15 / 25 / 35
Bonus Damage: 20 / 60 / 100 / 140
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Now for the Items that I use with Jayce and why.
The first Item I pick up are the Boots of speed
and I pick up 3 health pots too. The next Items I pick up are Brawlers Gloves

for the 8% cirt and a Vampiric Scepter

for the 10% life steal. After those to combined them together for the Executioner's Calling

for a 15% crit and a 18% life steal. now that I have The Executioner's Calling I can build up too a Infinity Edge

for a 25% crit and a 80+ Damage.But before the Infinity Edge I build the Berserkers Graves

for a
25% attack speed. From here I build a Phantom Dancer
for a 55% attack speed, 30% crit and a 12% movement speed. Now I build a Bloodthirstier
for a 60+ attack damage and 12% life steal that builds to a 18% life steal. I also build a second Bloodthirstier
and a Second Phantom Dancer
.
With these Items I'm able to rule the battlefield. In this blog I will not be telling you anymore to get the rest of the info that is need to be the god of all Jayce on the battle field, you must watch my new video on Jayce which will be out by Friday this week so remember to sub to our YouTube channel here is a link
http://www.youtube.com/user/CdnGameGuides?feature=plcp