Get the "Crescent Falchion" weapon early in 4-1.
Just kill the rolling skeletons (pretty easy) until you get to where the weapon is. There is a tough, dual katana wielding, dark skeleton guarding the shiny weapon. Just target-lock him and he'll charge you with a lunge attack. He needs a lot of time to recover from this move so when he does it, break the target-lock, grab the weapon, and either die or run to the nexus.
Game becomes too easy after this.
You might also want to grab the flame shield after killing the red dragon, since it reduces the damage the flamelurker does to you.
"Common sense is not so common." - Voltaire
Platinumed Destiny, Vanquish, Ninja Gaiden Sigma Plus, Catherine, and Metal Gear Rising. Get on my level!!