Source: Bestiary 4, pg(s). 33
The clockwork steed is a clockwork creature designed by engineers as a replacement for horses, capable of carrying their riders for days if required. Unlike normal horses, they have no personality, cannot form bonds with their riders, and obey their orders without question.
Clockwork chargers are equipped for enhancing mounted charges, sometimes doing so without the need of a rider, due to their pivoted latch large enough to support a lance and allow even those who are not proficient with a lance to use it as if they were.