In Ark Valguero, Sulfur can be extracted from small, yellow-streaked boulders often located up in the hills, next to Wyvern sites and volcanoes. You can also get this resource by killing Rock ...

Sulfur is one of the major resources you’ll come across in the Ark Crystal Isles expansion. Sulfur is necessary to make the Flame Thrower, Preserving Salt, Propellant, and used to preserve salts.