So I was thinking this. The gear that it would use must be found before Depths and maybe Blighttown. I was thinking using a Fire +5 weapon, as you can just go to Vamos in the Catacombs before entering Depths. The Slimes at the Depths drop Green titanite Shards and Large titanite Shards, so a Fire +5 weapon is accepted. Maybe I could use a Normal +10 one, with low scalings.
For armors I would use any armor that can be upgraded up to +7, which is the cap for Large titanite Shards. For rings Wolf, RoFAP (Lautrec drops it), Havel's ring and DWGR (you can access this by buying the Crest of Artorias from Andre). As for spells I would say all the Pyros from Laurentius and a Pyro Glove +15. What so you think guys?