Fibrous Brimstone is an item acquired through mining Ventures at level 231. 12 are acquired after 12 hours have elapsed.
The Mantuban's Legacy quest is required the start the Venture.
Once you acquire Fibrous Brimstone from the venture, you can bring it one map west to Tommaso Torrelli who will turn it into Eruptive Explosives, which can be used to acquire Sturdy Deathstone.
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Mine of Mantuban
231
231
