Quote Originally Posted by Victorsix View Post
Why does there need to be some special construction to allow one-way sound travel? None of the characters up top have enhanced elven hearing; maybe they just failed their listen checks?
Because:

1- We see the special construction, just look at the panel.

2- The people who were supposed to use the tunnel don't have accute elven hearing.

3- They possibly devised their defenses to work against elves too (since their territory is rather close to the pyramid), so an elf in the upper level should not be able to hear a Draketooth on the tunnel.