When longswords first came into use in the 13th century, knights mainly used them to slash through an opponent’s chainmail. But once plate armour entered the battlefield, these slashes were useless. Now, sword-wielders had to thrust their weapons into gaps and weak points—a new kind of fighting that required a different kind of blade. Longswords evolved to be longer, narrower, and more pointed. The central groove (the fuller) that lightened and strengthened the old models was replaced by a ridge (the riser) that conferred rigidity. A cutting weapon became more of a stabbing one. Form followed function.

Each species of rhino beetle has its own distinctive headgear, and each fights in a different style.  The largest of them, the Hercules