Notes from author
Since there is no mercury upgrade path in Dark Souls, we have to find a solution ... And it's called Rotten Pine Resin.
Weapons to use :
Painting Guardian Sword +15 : with the pine resin, it has poison, and it has bleed. That's damn fun. And it's probably the best weapon EVER when enchanted with DMB/SMB (enjoy your 600+ damage, twice per second).
Chaos Painting Guardian Sword +5 : against Great Magic Barrier.
Crescent Axe +5 : underrated weapon, excellent for faith/dex or faith/str builds.
Divine Gargoyle's Halberd +10 : for the catacombs, some bosses, and also for pvp sometimes.