Master key for early & backwards Blighttown access
After Queelag kill the discharge. suicide run for the Chaos Ember.
Grind the Worms near the fire sage for the red Chunks (when you belive you are able)
Trade a asencended Pryo to Snuggly for the Red Slab
if you use another class, you can put 2 points in INT & engie can give you the secound pryoflame. or just wait until NG+ on knight you wont need PW till then anyway