Ok, Exarthious, I'm going to talk to you under the pretense that you are speaking and understanding proper English. Rammus will be effected extremely minimally by Thornmail. Rammus's skill at killing Tryndamere involves Tryn literally killing himself on Rammus, in addition to his Ultimate. What you need to kill Tryn is simple. Any form of CC to use on him while he is in his Ultimate. Ignite to finish him. Not necessarily a move that allows you to get in and out, but it helps. It gets very old when people complain CONSTANTLY about Tryndamere on Twisted Treeline while ignoring the inevitable advice on how to counter him.