You can find sulfur clod in the mountain's cave where you do mining task for the dwarf. You need to drink warmth potion and wear warm cloths which dwarf give to you.
thanks for the advise, but I'm still not finding or getting any sulfur clod maybe I can get it for coincidence? I don't know
You need to search it in the cave. it's RNG so you may have to try some time to get it.
