Ok, this is my first build and i'm sure many people disagree with this build, but i play tryn like this and i own with him. TBH im not even lvl 30 so i dont realy know wich runes and wich masteries i will take, but i assume i will take these runes/masteries in the future.

Go for attack speed and critical strike rating.

Ofcourse you put your focus on the offence tree. This offence tree+ a bit defence tree for late game is a pretty basic one.

Ok this is how i do it and why my tryn build is a good one. First of all start of with some lifesteal. Than get some speed with the boots. Now you are probably wondering why i dont use any potions, well i can keep myself up with bloodlust. After that go for some attackspeed followed by damage. If there are alot of hard DPSers in the game, go for some armor. This variates of what kind of damage, so thats why i took the guardian angel armor

Go bot or top with tryn. Prefferable with a ranged or a stunner. Just try to get some hits on the minions untill ur bar is full. Make sure u keep urself at good health, thats very importand because there are no potions in this build!

After the tower is down in your lane, try to jungle a but and get the buffs from the creeps. If you have some damage items than go gank some champs ;). Late game you will be unstoppible and you can solo baron. (only if you have the full itemlist and no armor, but instead of the armor the bloodthirster)