Bonfires currently respawn enemies. Thus, once you reach the Firelink Shrine, use the bonfire. Then, teleport back to the first area and all the enemies will have respawned. You can kill them again with minimal difficulty and work your way back to Firelink Shrine. Repeat this as many times as desired. This can be done with any bonfire to respawn enemies. To get more HP and survive longer, ember yourself while doing this. After you ember yourself, use a dried finger. This increases the amount of souls you gain for a limited time, but you have to be embered for this to take effect. Additionally, equip the Covetous Silver Serpent Ring to get even more souls between rests at the bonfire. Note: This exploit was performed on patch 1.04 of the game. It will eventually get patched. To avoid not being able to use this exploit, either do not install new patches before using this exploit or delete the patches. You can avoid patches being installed by disconnecting from the internet until you are ready for the game to install new patches.