In Roman mythology, the most feared god was often considered to be Mars, the god of war. While many Romans revered him as a patron of their military endeavors, they also feared his wrath and the destruction that war could bring.
Mars was not just a god of combat; he represented the violent and chaotic nature of armed conflict. The fear surrounding him was not only due to his capabilities in battle but also because of the severe consequences that arose from warfare. The Romans understood that Mars had the power to incite battles and bloodshed, and they were aware that his favor could mean the difference between victory and devastating defeat.
Additionally, other gods like Pluto, the god of the underworld, also instilled fear due to their associations with death and the afterlife. However, when it comes to the immediate terror of conflict and war, Mars holds a prominent place in Roman consciousness as the most feared deity.