Dwarf related dangers

What is your favorite dwarf related danger? Here’s the options:

• Jolati with buggy pre-programmed commands.
• Gobbler seeking stolen gunpowder.
• Angry spirits escaped from a faulty Silver Dwarf energy matrix.
• Mechanical construct (tiktok) with limited self-awareness.
• Bound energy construct, abandoned by Silver Dwarfs.

I am ignoring Gremlins and Nilmergs because they are annoying.

As an aside, I view Dwarven mines and strongholds as full of weird things that the dwarfs used to assist them in their labor, sources of energy, or defensive systems.

Spirits are a key renewable energy source!