Corki

How to play this build

Poke with Phosphorus Bomb (Q) to reveal and punish from range, and use Valkyrie (W) to escape or fly over a target, leaving the Liandry's-boosted trail burning. Save Missile Barrage (R): with two charges by default you can fire two bombs almost back to back, and every fourth missile ('the big one') hits much harder and always lands.

Skill order

Max priority:

The ultimate (R) is always leveled at 6, 11 and 16.

Why this order

Phosphorus Bomb (Q) for poke and reveal; Valkyrie (W) second because with Liandry's the trail burns harder the more you rank it. Gatling Gun (E) at 1 point — on this build he barely auto-attacks.

Items and what they do

1. 
   Deathfire Grasp The classic burst item: AP + active that deals % target-health damage and amplifies your next hit. One-shots.
2. 
   Rabadon's Deathcap The biggest AP item in the game: multiplies your total AP.
3. 
   Void Staff AP and % magic penetration; a must vs. enemies stacking MR.
4. 
   Liandry's Torment AP and pen; your spells burn % health over time (double vs. CC'd targets).
5. 
   Sorcerer's Shoes Boots with magic penetration.

Runes

In Season 3, runes were a system SEPARATE from masteries: bought with IP (Influence Points) and slotted into 4 tiers — Marks (red), Seals (yellow), Glyphs (blue) and Quintessences (purple, the strongest). They gave flat stats: damage, armor, penetration, etc.

Magic pen, MR/level, AP quints

Masteries: how they work

In Season 3 you have up to 30 points (at level 30) to split across three trees: Offense (damage), Defense (durability) and Utility (mana, cooldown reduction and mobility). The notation 21/0/9 means 21 points in Offense, 0 in Defense and 9 in Utility.

Masteries

21/0/9 — Offense

Why this page

21/0/9 goes full AP because the passive's on-hit true damage doesn't matter here at all: all your damage comes from spells.

Summoner spells

Flash Ignite

Lane

Mid

Original role

Mid ADC-mage