Y-17 advanced animatronic skeleton

 is a creature living in the Big MT in 2281.

Background
Even deadlier and far more advanced than the Y-17 animatronic lab skeleton. It was probably the last prototype created before the actual suits were created.

Appearances
Y-17 advanced animatronic skeleton was to appear in Fallout: New Vegas add-on, Old World Blues, but was cut from the add-on.