Tryndamere is an awesome champion with the right build. I just got a very good build, i was against 2 heavy armored champions (Rammus and Mordekaiser) so i figured out to take a Last Whisper. With this i got a Penta kill the first game. the 3rd game i got another penta, so it works very good for me, u should try it aswell

Farming is very important after the recent patch. Because if the last hit minions u get more rage, and with that rage u get more crit % and makes it easy to damage lane enemyes and farming.
U need to farm ALOT to get the build as quickly as possible, so you can get that penta kill that everybody wants to get.