Hi, I'm A12.Scarlet, a Challenger player on the SEA servers. Jayce is one of my favorite champions and I have a 88% win rate on him. So today I'm gonna show you how to bully everyone and carry your entire team on Jayce!

Pros

+ Has a flexible ability set (two actually) + Deals a lot of damage from afar + Excels in laning phase + Clear creeps easily

Jayce has a flexible skillset thanks to his ability of having two stances: Ranged Mercury Cannon and melee Mercury Hammer so that he can be multifunctioning in combat. He also bullies almost everyone in the lane thanks to Shock Blast + Acceleration Gate combo which I'll explain later. And he clears creeps easily w/ To The Skies! and Shock Blast, so he always push in the lane.

Cons

+ Heavily relies on mana + Lack of CC + No dashing/escaping ability

Jayce needs to be casting abilities all the time, so he must keep an eye on his mana bar. Also, the only CC he has is a slow from To The Skies! and a knockback from Thundering Blow. That sometimes might not be enough. Also he lacks an escaping ability, so he is very vulnerable to ganks

• Greater Quintessence of Attack Damage: Simply just add more damage for Jayce.
  
• Greater Mark of Attack Damage: As above.
  
• Greater Glyph of Cooldown Reduction: A littel bit CD reduction at early game helps Jayce to spam more.
  
• Greater Glyph of Mana Regeneration: This is extremely necessary for a mana-starving champion like Jayce.
  
• Greater Seal of Scaling Health: This is my personal choice. You can also take Greater Seal of Armor instead.

I use the standard 21-0-9 for AD Casters. 9 points on Ultilty tree helps Jayce on regenerating, but if you like to play offensively, take this 21-9-0 instead.

Flash is a must have, since Jayce have no escaping ability. The remain slot should be one of these:

Just a little damage to finish them off

if the opponent's mid laner have hard CC ( for example)

I'd prefer this over since is countered by with Grevious Wounds.

We will want to maxed out To The Skies!/ Shock Blast (Q) first as it is our main source of damage. Then, I would prefer Lightning Field/ Hyper Charge (W) over Thundering Blow/ Acceleration Gate (E) as it will give you more damage and sustain. Rank your ultimate Mercury Cannon/ Mercury Hammer (R) whenever you can.

The 15% CD Reduction from this item helps Jayce a lot in spamming skills.

An early Tear of the Goddess upgrading into Manamune can solve all your mana problems. Besides, the cool active gives Jayce TONS of damage

Great sustain for Jayce. You can just walk out of the battle w/ 30 health, use Hyper Charge and you're already healed to 50%! The shield helps a lot in small fights, too.

Gives Jayce health, CD Reduction, and a cool pasive which can shred even the tankiest champs, all in one item. Jayce an easily charge 3 stacks of this w/ a simple Hyper Charge. How cool is that!

Solve Jayce's Muramana mana use problem. You use mana and deals way much more damage, then gains mana again on the damage! No more toggling, the Muramana can stays on forever!

Combined with Black Cleaver, Jayce can shred every tank to their core. 65% of Armor Penetration? That's crazy!

Jayce can easily win the lane against almost all matchups. Shock Blast + Acceleration Gate combo provides great poking, easily zone enemies from creeps, denying gold and xp. Just stays in Mercury Cannon form and farm. If the opponent jungler is coming to gank, quickly changes to Mercury Hammer, Thundering Blow him back and then run with the increased movement speed. If that's not enough, use Acceleration Gate right before switching and you will run to safety very fast. If you want to burst down your opponent, use this combo:

- Acceleration Gate + Shock Blast
- Switch to Mercury Hammer
- Run up and use To The Skies!, then auto-attack to proc the bonus magic damage
- Run pass your enemy and Thundering Blow him/her back
- Activate Lightning Field then switch back to Mercury Cannon
- Use Hyper Charge

If that's not enough, combine with an Ignite at the end and you will surely get the kill. Then just snowball him/her hard and roam to help other lanes

Before teamfights, try to poke the enemies' carries of by using Shock Blast + Acceleration Gate a couple of times. Wait for your team to engage with hard CC, then pick the time to come in with To The Skies!. Always turn Lightning Field on while in the middle of the battlefield to deal a lot of damage. Finally, as soon as you jump in, Thundering Blow the enemy's tank out of combat, so your team can focus on the carries.

Jayce is very flexible, so he works well w/ all teammates. But the best teammates of his are initiators, who can apply hard CC after boosted by Acceleration Gate and protect him in combat, such as:

+ Leona
+ Morgana
+ Annie
+ Hecarim
+ e.t.c

Jayce shares the same weakness with all AD casters: late game weakness. Also champion with high mobility can easily dodge Shock Blast, such as:

- Yasuo
- LeBlanc
- Riven

or late game OPs like:

- Ahri
- Kassadin

can give Jayce a hard time

Frequently Asked

Answers

Q: Is Trinity Force viable on Jayce?

// Totally yes! The Sheen procs is very good on Jayce, and the Rage helps him in kiting. But for me, I'd rather go Iceborn Gauntlet + Black Cleaver as above for the AoE slow and the armor shred

Q: How can I not miss Shock Blast + Acceleration Gate?

// Here's a tip: Put the Acceleration Gate right below your feet, so your opponents can't predict the direction of Shock Blast and will have a higher chance of being hit.

So I've just introduced you to my Jayce guide. If you find this guide useful, please give me a +1! Feedbacks are appreciated so I can improve this! Thanks for your time.