Y-17 advanced animatronic skeleton

 is a creature living in the Big MT in 2281.

Background
Even deadlier and far more advanced version than Y-17 animatronic lab skeleton. However, it is unknown why he was created in the first place.

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