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 Fibrous Brimstone has been obtained from the venture, it can be broguht one room west to Tommaso Torrelli who will turn it into Eruptive Explosives, which can be used to acquire Sturdy Deathstone.
This information has been manually compiled. Some updates may not be included yet.
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Mine of Mantuban
231
231
