Stale Mary is the leader and guide of the undead inn the Dead Collective.
She has more sentience than most other zombies, and has a very slurred, yet discernible speech.
If asked why they can understand her better than most zombies whose vocal cords are rotting away
She tries to touch the adventurer. If they let her touch them, they can learn the Stories-Bones-Tell ability, which allows them to speak to corpses.