Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Why i play with this runes? Its very easy... cause
Armor Pen > Crit Chance > Crit Dmg
MP5/lvl is a must have on the start you need it for last hits with your Q or harass
i pref the CD reduce Runes cause it helps you to farm faster on the start
The Quintessence of Avarice is a MUST HAVE GP needs amazing much money with this runes + the mastery + Q Last hits you will be able to get the money what you need
Why this Items? Very easy to say you will be ****ing useless when you dont have enough Life its not enoug when you only use your Q Skill and Ulti in Teamfights as GP you are a Meele Champ and you have to fight them like one.
Dont use only Q Skill and Run away then you are very Strong Meele Champ fight like one. Try to fokus the the Carry and Supporter on the enemy Team. Dont Waste your W Skill to soon on start! Use it to brake the CCs on you and to Heal you when you are on like 50 - 60% Life.
This is the important Point with GP you need as much farm you can get you will fast see when you dont have enough farm you are weak and dont do enough damage in 1vs1 or also in Teamfights. Try to farm the whole time dont leave your Lane to soon for ganks or something else you need farm you need the money or you will be useless!