In certain comic universes, the Speed Force has faced significant events that could be interpreted as its 'death'. However, comic storylines are complex and can vary greatly.
The Speed Force in Young Justice fanfiction can also be a source of conflict. Maybe the Speed Force starts acting erratically and causing problems in the world. The Young Justice team has to figure out what's wrong with it. Is it being manipulated by a villain? Or is it a natural imbalance? This could lead to a complex and exciting storyline as they search for answers and try to restore the Speed Force to its normal state.
In certain comic arcs, Barry takes actions that lead to the destruction of the Speed Force. This often has significant consequences for his powers and the superhero universe.
One idea could be Percy Jackson somehow gets connected to the Speed Force. Maybe during a quest, he stumbles upon a portal or an ancient artifact that links him to this powerful force. He could then gain super - speed, but struggle to control it at first. His demigod powers might interact in strange ways with the Speed Force, like his water - based powers could be enhanced when he moves at high speeds, creating some kind of water - speed hybrid attacks.
It depends on the specific comic series. Some comics focus heavily on the speed force and mention it often, while others might only touch on it briefly or not at all.
A common theme is the origin of speed powers. Writers like to come up with unique ways for characters to get connected to the Speed Force. It could be through some ancient artifact or a scientific experiment gone wrong.