The Achatlan Invader's Plans

Warden Tyndale believes that someone within the Achatlan Caves is organizing the Ettercaps and Redcaps, but he is unsure of why. Travel into the Caves and attempt to discover the invader's plans; a subtle approach, such as eavesdropping, may be necessary. - Discover the Achatlan Invader's Plans

Tyndale tells you, "The missive that you brought back was not exactly what I needed. While it does lend credence to the presence of someone within the dungeon who is responsible for the organized invasion, it does not detail their plans or who the person works for." "I need you to return to the caves and attempt to discover the plans of the invaders. I'd imagine that they have avoided writing down their plans, so you will likely have to eavesdrop on some enemies." "Return to me with their plans."