Extinguisher is a magic Greataxe in Pathfinder: Kingmaker.
The bonus is +5 Attack/Damage versus only Will-o'-wisp, Ancient Will-o'-wisp, War Wisp (including the ones in Swamp Witch's Hut's well) as well as bosses Duke Dazzleflare and Viscount Smoulderburn.
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Crafted by artisan Varrask the Wildfist (Tier 0).