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26/04/12 - changed most of the guide after playing him more.

Tryndamere is a great easy champion to play. Why? It's because he demolishes people using his auto-attacks. My favourite part is getting fed and destroying people who go out alone. By the end of the game people will be getting thornmail just to counter you and calling Tryndamere OP.

Pros
Great farmer
Easy to use
Hard to die
Easy to score kills
Hard to kill 1 v 1 because of Undying Rage

Cons
If stunned you will be focused and destroyed
You can get harrased by ranged champions like Nidalee early-game
If you dont get farm you can't do well

I have chosen armor-pen marks for more damage, armor seals for defense early game and magic-resist per level for the late-game magic-resist. Movement speed quints make chasing so much easier so thats why I have them.

I go 24/6/0 for improved ignite, attack damage, life steal, armor-pen, and attack-speed in the offense tree and have chosen armor and magic resistance. This set up gives you high damage and some defense. If your level is lower then 30, get your offense first, then your defense masteries.

I go an early Boots and three Health Potion for the movement speeed and sutain, on my first recall i usually get my wriggles lantern and finish of Mercury's Treads this should help you sustain in lane. Then you should build into a Phantom Dancer and Infinity Edge by now you should be dealing 'tons of damage' (phreak) and you can start building more tanky. You should start with a Phage for the slowing effect and build an Atma's Impaler for more damage and a Warmog's Armor then you can finish off your Frozen Mallet while selling your wriggles somewhere in-between.

These items are your main damage items giving you nearly 100% crit chance combined with your passive Battle Fury.

against AP carries also synergises with Undying Rage.
against cc.
against AD carries

I get an early point on Spinning Slash so that you can escape and initiate very easily. The I start maxing out Bloodlust followed by Mocking Shout and maxing Spinning Slash last, getting Undying Rage whenever it's up. For Bloodlust you dont want to be using it when you have full or close to full health because you might get ganked so just wait, even if your fury bar is decreasing, if you use it and its on cooldwon and you get ganked there is no way to heal back up if you dont have your support, and even if you did, it wont be much of a heal. I max Mocking Shout second because it is great harass, when ever the opposing carry is coming to get a last hit, use it and they won't get it if your good at timing. also when chasing, the extra slow helps SO much.

For summoner spells I go for Ignite and Exhaust. Ignite is great on AD carries like Olaf or Jax because of their healing and also gives you a bonus 5 attack damage while it's on cooldown. Exhaust is used on the enemy ranged AD carry like Ashe or Caitlyn in teamfights because it reduces the damage they do. It also works well with your Mocking Shout because of the slow and damage reduction.

In teamfights you want to go for the opposing team's AD carries like Ashe or Twitch. In your lane target the opposing support because without them, their carry cannot farm as freely. To get to them, fight in the front lines then Spinning Slash on to them when they have use all their disable. This guarentees an easy kill but escaping is a problem. Run towards the jungle if spinning slash isn't up and lead them into a chase while your team pushes the tower. and if they dont chase you, it's basically a free kill for your team and probably many more because their carry is down. However, if your Spinning Slash is up, just Spinning Slash out and your fine.

Once you hit level 6 you can finally get the kill if they are playing very defensively. Tower dive them and pop your Undying Rage as soon as you hit 100 health this should guarentee a kill for you, then Spinning Slash out of their and go back to base. Mid-game you want to gank mid often if they are pushing, it helps to have a mid with can stun/snare/supress because that will guarentee a kill for your team. Also whenever your jungler doesn't need the red buff you should ask them if you can take it, the slow effect on it ensures your target cannot get away.

Overall Tryndamere is an easy to use fun AD carry to play. Once fed, the other team is lost, you can be on 1 health and just life steal it back from the jungle so you don't need to recall often. Make sure you recall whenever you have enough money for Infinity Edge as that is your main damage item. Pls vote and comment to tell me what I can improve as this is my first guide of many to come. Also leave your scores in the comments so i can add it to the guide :) have fun with Tryndamere! ;)