Hi,
You might need to invest in a spell like curse, blind, or hell spikes to face the black ring later, especially Josephina based on the spells you have. As long as your resistances are 100 or higher you won't need Spellshield. It should be there once you're about to face the Black Ring. Have a lot of small restoration potions. I had almost 1000 near the end of the game when I was facing the Black Ring but if you have about 500 restoration potions, that's more than enough.
Thanks.
