Let Sleeping Dragons Lie by Garth Nix

Brilliantly funny adventure for boys and girls, featuring magic, sword action and knights
For fans of Shrek
Odo and Eleanor are now officially knights, helped (and sometimes hindered) by their magical but rather difficult to control magical swords. But if they thought life as a knight was going to be easy, they are wrong! Before they know it, their first task is to tackle some ferocious bile wolves! A funny fantasy triumph from Garth Nix and Sean Williams, the perfect sequel to Have Sword, Will Travel.