Final Boss Strategy
Beating the final boss in Dark Souls is actually easier than you might expect. In fact, it is possible to defeat it without taking a single hit. The first thing to consider when taking on the final boss is to parry as much as possible.
You can parry and riposte the boss until he has zero health and without taking any damage. If you are struggling with this, remember that the boss specializes in Fire attacks, so use Flash Sweat to absorb some of this damage and use a Black Knight Shield for additional Fire resistance. Try to attack after every four-hit combo that the boss sends your way.
You can use the arena's pillars to lure the boss to, then run around them to stay out of his reach. This can buy you the time you need to drink an Estus Flask, and just generally helps if you need a breather.
Added by: MongooseGeneral Jan 7th 2013, ID#8942