Years ago I've completed Dark Souls 2 using only magic (sorcery + pyromancy) - so no weapons at all. It went surprisingly smooth although I ended up not going to DLCs.

I'm thinking on doing this for the first installment but I have some doubts:

• First, is it even possible to beat Four Kings with spells? On my first playthrough I tried to beat them with magic and it went really poorly. I'd prefer not to repeat this experience...
• Second, are locations like Duke's Archive and Oolacile even doable with spells? With the sheer amount of enemies with high magic resistance, they sound like hell, especially given that we don't have any magic restoration options from DS2.