This is a Build for Tryndamere that will keep you longer in team fight and will prevent that you get a one shot death by overfed champions. it's made with inspiration from the Immortal crit build. this build wil work for Solo lane as well as dual lane

For the ruines i have chosen full crit Runes mainly because that's what playing tryndamere is all about getting the rage bar to 100 and than burst your crit against the enemy's.
It's quite expensive but eventually surely worth it.

the masteries is a little different because of the no use of executioner because that 6% extra dmg when the enemie is low is almost not wort the poin when you can use it for some usefuller stuff like reduction of time spend death what will come in handy when you are in late game.
further more is the little bonus movement speed sometimes the key of getting the enemy champion to their grave or letting him escape.

the Items are pretty obvius you'll see that the beginning bonus crit will come in handy early game for a great amount of dmg thanks to the expensive runes. further more i chose after the first blood thirster a warmogs armor. this is something that will help you to sustain more in team fights and prevent you from being completely useless against overfed range/caster champions that can one shot you without it. further more i chose for first making a zeal that buy a vampric septer and folowd bij building a infinity edge with the first item for that i would prefer the dmg item because of the zeal and your passive you'll have enough crit for the moment. if not than you can always buy elixer of agility which i recommend to buy most time of the game so you get a little more attack dmg and a nice crit bonus. after you have bought the infinity edge you can finish your phantom dancer and first bloodthirster. at this point in game your enemy's will be nicely fed and you'll get a lot more dmg than you would like and let's you only sustain for a little burst damage before you need to run. so with the nice sustaind bonus from warmogs armor you'll can keep up with the damage and sustain to break their necks with your oversized sword. and to finish everything a little more dmg and life steal from your second blood thirster if your enemy's wouldn't surrender at that point in game