(I am putting this here in the OOC thread because there are a lot of things that I realize Guran does not know.)
More OOC stuff regarding the stone chest in the northeast hidden room:
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Guran can picks locks. However, Guran also is fearful of alchemy--partly because he doesn't understand it.
As far as Guran knows, that dead mouse behind the stone chest could just as easily have been killed with Thunder damage, then varnished on its underside and laid by hand behind the stone chest, in order to fool any thieves into thinking that the chest is covered with a contact poison. (The room was sealed by a well-fitting stone door that would not have let a mouse in.)
The dwarves of Stonefast were rumored to be alchemists of an unfavorable repute. They founded Stonefast in order to continue their researches, which were abhored (or at least disliked) by the rest of the dwarves. Did the dwarves of Stonefast invent an instant-paralyzation gas that can be applied as a liquid, and only detonates when lit?
Did the dwarves of Stonefast invent a high-explosive (comparable to the power of "C-4" nitroamine plastique) that can be applied to the lids of chests? Guran has heard that they were expert alchemists, but he doesn't know whether they saved their best potions to protect their deepest secrets. He also doesn't know whether that stone chest holds their deepest secrets, or whether they would have cached such stuff far into the depths of their settlement.
Guran does know that if the material atop the stone chest does detonate, the blast will catch everybody who is in the hidden room with it: Colden, Fulgrim, and Spec.
Guran probably does not know that Fulgrim knows the Fire Bolt cantrip, which could light the material atop the chest at a distance, through the (open) hidden doorway from the room where Roscoe was hiding.
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Edit to add: From a purely metagaming point of view, I'm trying to share the spotlight a bit: it was Guran's search that found the hidden door, and Guran's Perception that located the lid coating and the mouse, so it would be more interesting to me for him to step back a bit and let the rest of the party do more here.