Irrlicht Engine

I am working on a medieval style game. I am wondering what should I use for shaders to give it that fantasy feel.

Maybe if you just specified the expression "fantasy feel" a bit...

I guess i want it to look like a mix between the pc game "Guild Wars" and the ps2 game "Ico".

Then you need to learn how to write shaders that will give you the "look" you want...
Try: http://www.irrforge.org/index.php/Shaders is get started.

I will, thanks for the help.