what you wanted to do? That wasn't clear (to me at least).
Still, since Vesth didn't answer just now (unless it was in a PM or something), you should probably roll (I assume Arcana?).
And yeah, the orb is right there, of course we'd focus on it first and then exploring the cave. What if it was "the orb of sealing the cave behind the impatient morons"? Always gotta be on the lookout for those.