RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Dwarf brew
The Old School RuneScape Wiki also has an article on Dwarf brew.

Dwarf brew is a quest item used in the Underground Pass quest. It is used in combination with a tinderbox to destroy the Tomb of Iban to obtain Iban's ashes, and may be obtained by using a bucket on the barrel near Klank in one of buildings in the Dwarven Camp.