This is build about Trynda that have target to get big damage, some armor penetration, and 100% crittical chance (your crit attacks will deal 250% bonus damage).
Masteries are specializate on offense and on criticcal.
Summoner spells are: HEAL and IGNITE (it is to good spell vs opponent to reduce healing).
From the start farm on minions (dont be so much agressive). After you will get Zeal you can start to be agressiver and agressiver (but don´t go for kill under tower :D).
Do ganging how you want, but I think that Trynda is really good in 1vs1, but he can be good in a gangs to.
Runes are builded to get some damage and much of HP for longer staing on the line.
When a gang is going on you, go to the nearby close wall and after all opponents are next to you use Spinning Slash to go through a wall and run away :D .