Overgrown Tunnel
The Overgrown Tunnel is a Location accessed from the Riverside Teahouse in the Sunlit Wetlands. It is the first section of the lair of the hag, Auntie Ethel.
Area Information
The Overgrown Tunnel dungeon consists of three sections: The Overgrown Tunnel, the Ancient Abode, and the Acrid Workshop.
The Overgrown Tunnel is the first of three sections of the hag's lair. The remains of previous victims, (some dead, others broken) of the hag are scattered around the area. 
Speak with Dead can reveal some of their pasts.
Access to the rest of the dungeon is blocked off by a Gnarled Door. The door is one of the hag's previous victims, transformed. The player can speak with it and succeed at persuading it to allow them them through in order to realize that the door is an illusion. Alternatively, wearing one of the nearby Whispering Masks will reveal the true nature of the door.
The Masked Victims
The next room contains four more previous victims of the hag. They are all wearing Whispering Masks and are being controlled by them. If the party is not also wearing the masks, they will attack. This room is covered with Mud (difficult terrain).
Trapped Descent
Past the four masked victims is a waterfall. Jumping through the water will bring the party to final part of the Overgrown Tunnel. This area is a steep descent down to the Ancient Abode, covered with climbable vines and many traps. It is covered with Noxious Fumes, being emitted by Ruptured Stones. The stones resemble piles of rocks, and can be covered by objects to block the fumes. The stones can also be disabled with a DC 10 Sleight of Hand check. The path downwards is also trapped with numerous Peculiar Flowers, which are hidden until spotted with a Perception check. They will explode if a party member draws too close.
- If Auntie Ethel is later defeated, the Ruptured Stones will stop emitting fumes. The Peculiar Flowers remain, however.
Misty Step and 
Feather Fall are useful for avoiding the traps safely.
The next part of the hag's lair, the Ancient Abode, is at the end of the descent.
Mushroom Circle
There is a second Gnarled Door that can be reached from the trapped descent. A Whispering Mask is required to gain access to the room beyond. Inside is a Mushroom Circle that will teleport the party to a similar circle in the Underdark, X: 98 Y: -283.