Prepare yourself. This build is meant for those who are ready to seriously pwn as Trundle. This build is extremely powerful and effective. Late game you are unstoppable. This build can not, however, make up for a player's lack of skill. Advanced players only, yet those ready will find that this build is unbeatable.

You can get these items in your own order but I suggest the following for the begining: Doran's Shield -> Boots -> Emblem of Valor -> Boots of Swiftness -> Stark's fervor -> Sword of the Ocult. Go on from there depending on the champions you are up against (example: up against alot of tanky chars? Then rush Madred's.)

The Swiftness Boots are best in my opinion because they go perfect with his Contaminate ability which gives massive movement speed increase. This will allow you to stay up on enemies, or help you to run away from a bad fight. After all, Beserker Greaves won't help if you can't stay up on the enemy in the first place. Youmoo's Ghostblade serves this same purpose. The activation gives 40% movement and 50% attack speed, perfect for chasing/running and especially dmg output. But Youmoo's Ghostblade also gives attack dmg, armor pentretation, and even cooldown reduction - don't miss out on this item, plus the Avarice Blade will help you to farm gold for both it and other items.

Sword of the Ocult & Leviathon - Do not dare underestimate these two items. If you play Trundle right, you should be able to avoid death through careful and intelligent use of Contaminate combined with Pillar of Filth. Join the team fights, and let those kills and assists feed you beyond imagining. Even at 7 stacks, these items make a noticable difference. The Sword of the Ocult is going to make your Rabid Bite hit very, very hard. At 20 stacks you receive 15% increase movement speed - again, movement speed goes perfect on Trundle. Leviathon will give you great survivability and at 20 stacks you reduce all dmg taken by 15%. Mmmm.

Madred's Bloodrazor- I should not have to explain why this item is so good. This item not only gives nice dmg and attack speed, but it deals 4% of their maximum health in magic dmg each time you attack. Now you are a tank killer. Characters like Rammus, Mordekaiser, Vladimir, Shen, Singed, ect... are now very easy to kill. This is a must have item.

Last but not least there is Stark's Fervor. I am explaining this item last because almost everyone gets this item on Trundle because they already understand it is great for him. This is the first item you will get. It gives great life steal, health regen, and armor penetration. It's wonderful. You could get a Bloodthirster instead, but I personally like the armor pen, health regen, and attack speed boosts of this item over Bloodthirster.

Summoner Spells: Why Exhaust? Because Exhaust is great for snaring and blinding the enemy, especially when combined with a Pillar of Filth. It is great for raping your opponent, or disabling them so you can get to safety. Ghost is another great spell for Trundle (as movement speed goes great on him). Why Ignite? Since Trundle is all melee this summoner spell will allow you to get the kill even when your enemy flashes away. Don't you hate it when characters get away with a sliver of health? Ignite will stop that.

This is my Trundle build, and is recommended for advanced players only. This build has been tested multiple times, and is very deadly. Enjoy.