Beat the Crack of Doom then look at your experience skills and see if it has the poison sword. When you go back to Shelob, hold "Y" then your sword will turn green.

There isnt a poison sword. All you do is keep fighting shelob, remembering to defend, and eventually youll kill it. When it climbs up the wall dont throw the swords at it, wait till it sends small spiders down to you. Kill all of them and watch shelob closely. When it moves slightly, run to 1 side and it will jump down. If you dodged it, it stunnes its self so you can get a few free hits off.

When you chop one of its legs off it starts running around really fast knocking you over. As soon as you can, use your special and it will yurn you invisible. Now shelob wont hurt you. While invisible dont use any attacks cos it will run out.

Good luck!!! You'll need it!!!!!