When you are fighting those guys with huge swords the best way to kill them to use magic arrows to bring the down and then to stab them when they are on the floor it kills them in one stab.

When you are in the throne room the best way to survive when there are archers is to hide behind the pillars and kill everyone else then use magic arrows to take them down then rapid fire at them.

WHEN FIGHTING DURZA ON THR LAST LVL FLY AROUND and use magic arrows on I'm constanly and when he fires his purple fire balls at ya use L1+X to deflect them to kill him faster.

When on the URGAL ATTCK! Mision make sure to use your fire breath to burn the oil feilds to do massive damage to the urgals and evil dragon rider kings troops(gallabroitrax) and try to tail whip or use magic arrows on large groups of enimies to send them flying.

As eragon use the set enemie on fire magic weneva you can to kill enemies faster(you unlock it on the durzas fortress lvl).
P.S. I have completed the game on every difficul;ty .

Durza is strong and fast so whatch your back when hes ahead of you use brisinger to slow him down. When he is close use sapihra's fire breath and you'll bring down big bad Durza

Saphiras flame attack is so lethal that you can kill many people with just one attack!!!

When facing a kull the best way to catch it is to go behind it and use your best attack on it.

When your Eragon the best weapeon is the bow and arrow. The sword is second best.