A technical addition to Wyv: the switches won't stay in the right position unless the other glowstone is present: they just jump back to the basic position. But to operate the switch you must open the door with another glowstone. So you do need two, unless perhaps if you could open one door, block it with a crate or something to keep it from closing, and use the glowstone close to the other door. Can't garuantee it will work, but I think I'm going to try it when I reach it with my current party (uh, do you call a solo adventurer also a party ?).
Probably not now I think it through, because you need to trigger both switches before removing glowstones. Aaaaaaarrrrrrrgggggghh, my beautiful theory down my own drain.
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