I thought so too, based on the description. The bonus only works in the Underhul levels.
glinstone on description are actually refering to glinstone city not the caverns
Its clearly mentioned that it works in Glintstone & Underhul Dungeons if u can realize that u have to enter uderhul dungeons in the beginning through Glintstone Town & the town n maps which u r referring is Garetta & its corresponding dungeons i.e Glintstone carvens.
So, no prob with the info.
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