First, I'd like to tell you that this is indeed a somewhat expensive build. However, as the game progresses, you will be getting kills in no time. This means that your build will be easily affordable, making you even more effective. This is a simple laning guide to Tryndamere, not a jungle (obviously). If you farm minions and harass properly, you basically become unstoppable. Besides that, let's move on to more detailed things. Also, please go easy on the rating and comments, this is my first guide.

These runes aren't chosen because I felt like it; they help Tryndamere be much more effective in team fights or solo fights. You use Marks of Desolation for the armor penetration. Being able to penetrate your enemy's armor will help you do more damage to them (clearly). Using Seals of Resilience is important. Tryndamere is a somewhat squishy person in the beginning and the end. Using these armor runes can help reduce the damage and help you last longer in lane. The Glyphs of Warding reduce magic resistance (I know, I'm pointing out the obvious). If you're versing AP heroes that do effective damage against you, then go with these Glyphs. Taking less magic damage is big in team fights and in laning, so try to take as less damage as possible.

I won't go over too much on masteries because they are just simple to understand. All these masteries benefit Tryndamere in one way or another.

As I pointed out in the introduction, Tryndamere's build can be quite expensive and hard to manage if you start to fall back. You might be thinking, "There are 6 items at the end of this build, how is that possible?." Well, you end up selling your Beserker Greaves when you are about to get your 2nd or 3rd Phantom Dancers (When you sell them is your decision). Most of these items are based on attack speed. There aren't that many damage items, but once your full build is complete, you'll be critting hard and fast. Keep in mind that you don't exactly have to be fed to manage this build, you just have to be well farmed and get kills every now and then.

Hopefully this guide has made you a better Tryndamere player. If there's something wrong with this build, or you find something that is more beneficial, please message me. Good Luck with this build and I hope that it brings you good!

Pros
Great Jungler
Massive Damage
Good in taking people down in team fights
Good solo fighter

Cons
Somewhat squishy
Useless if you fall behind on items
Can be ineffective w/o ult sometimes
Somewhat hard to lane at beginning