"Well, I had really expected more spiders to come crawling out," Iriander muses to himself. He Inspects the tree itself, checking it for a hollow or some kind of place things could hide. Berserker keeps an eye on the boughs above for any signs of spiders.
Spoiler: OOC
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Knowledge (Nature) to try and think of how long it'd take spiders to set up webs this extensive: (1d20+8)[21]
Knowledge (Local) on the spider population in this area, whether they're known to be dangerous or if there's been any noticeable changes anyone's noticed: (1d20+3)[10]
Shiny new Bardic Knowledge check on the Venomous Grove, too, specifically the spider population if possible: (1d20+2)[13]
Edit: Also, Berserker taking 10 on Spot for 23