Had pretty good luck today with my strategy to get the hell out of Blighttown until I've got toxin-remedies to deal with the bottom floor. The Darkroot Garden broccoli-dudes drop Purple Moss and Blooming Purple Moss, which is what I need. I farmed (get it?) a bunch of the stuff off the aggressive flora.
As I was human, I decided to make a go at the Moonlight Butterfly with Witch Beatrice's help. Sadly, I panicked and was hit by the homing missiles, and died. I didn't really want to give up, so I made another pass at it, and this time everything went swell, even though I was Hollow and couldn't re-summon Beatrice. My +7 Zwei wielded two-handed seemed to be enough once the thing landed to feed and restore. It never even got a chance to use its area effect spell.
So now I've got the Divine Ember to the 'smith, bought the Seal of Artorias, and have a Basement Key for somewhere I haven't been yet.
What should I do next? Finish Blighttown? Find the basement in question? Where the hell is the second bell, or am I getting ahead of myself?
Also, should I plan on wielding the Zwei for the duration of the game, or are there better weapons coming?
I keep trying to use other weapons, but none of them seem as, um, efficient as the Zwei.