I think that's making my point. I don't remember all the details, but I don't recall any serious security measures to get to this clone. Didn't they just walk in through the tunnels and pretty much find the clone right away?
It's important to keep in mind that in Thassilon times, this was an active facility in the heart of Sorshen's territory. If an enemy had gotten to the coffin, it'd be a serious security breach.
Expect a trap, sure. Expect a trap that can seriously impair your vision of your character, and appears to be competely unexpected in the game world, I dunno, it still seems more like a Grimmtooth's Trap to me.
Just saying, it's perfectly logical and developed, and high knowledge checks (or research back at the manor) can reveal a lot of this in game, or some spell theory and some logic and such. In any event, Players should be suspicious and expect a trap when they have such loot seemingly offered on a silver platter in an ancient and active dungeon, and they have only themselves to blame if they push their luck and dont like the results.
Could this kind of trap have reasonably been expected to have been discovered by (more) research back in Magnimar?
I'm not watching the YouTube screencasts, only listening to the audio, but I get the sense that Lindsay was pretty upset at the consequences. Perhaps my interpretation of her reaction is reinforcing my opinion towards this trap.