My divine great scythe +7 with 40 faith tore up nito, like maybe a minute of wailing on him in 1st playthrough. I'm unsure if it was just him being weak to magic, or whether it is just scaling actually doing its job, or just good weapon.
Least defence against: Asylum Demon - lightning Bell Gargoyle - fire Capra Demon - lightning Ceaseless Discharge - magic Centipede Demon - magic Demon Firesage - lightning Dragon Slayer Ornstein - magic Dragon Slayer Ornstein (Large) - magic Executioner Smough - fire Executioner Smough (Lightning) - fire 4 kings - litghting Gaping dragon - lightning Nito - fire Gwyn - fire Iron Golem - lightning Moonlight Butterfly - fire Pinwheel - weak to dying Priscilla the Crossbreed - lightning and fire Quelaag - lightning Seath - litghtning and fire Sif - fire Taurus demon - lightning
Most defence against: Asylum Demon - fire Bell Gargoyle - lightning Capra Demon - fire Ceaseless Discharge - IMMUNE to fire Centipede Demon - IMMUNE to fire Demon Firesage - fire Dragon Slayer Ornstein - very strong against light Dragon Slayer Ornstein (Large) - very strong against light Executioner Smough - magic Executioner Smough (Lightning) - strong against light 4 kings - magic Gaping dragon - magic Nito - lightning Gwyn - very strong against light Iron Golem - magic Moonlight Butterfly - magic Pinwheel - no strengths Priscilla the Crossbreed - magic Quelaag - immune to fire Seath - strong against magic Sif - magic and light Taurus demon - fire
My Dark Souls characters: SL100 priest kiln pvper, SL10 bandit darkwraith, SL660 pybro for testing, SL1 pybro darkwraith.