Everything had evolved.
Sometimes it was evolution, and at other times it was devolution. When the environment changed, organisms altered themselves to adapt.
Weapons were the same.
Every time a technological breakthrough occurred, and the nature of the battlefield transformed, a plethora of new weapons — from hasty, back-of-the-napkin inventions to those that were the result of long-term technical accumulation — burst forth in abundance. Their evolution was as intricate, diverse, and swift as that of organic life.
But there was a decisive difference between the evolution of weapons and that of organisms — the origin, or the source of evolution.