The setting of Event Horizon Battlefront Aditya is a place of conflict between super-powered beings, with all the horror it entails.
- The nature of the universe in Event Horizon Battlefront Aditya. Immortality has become one of humanity's characterisitics, but instead of being something to celebrate, it is a curse that plagues mankind.
- Humankind has become the only sentient species in the universe. They exterminated all other forms of life that possed a threat to them and conquered planets
- The Samanasya Temple, a group of religeous fanatics that follow a nihilistic ideology. Due to the curse of immortality impossed on humans, they see life itself as sinful and would commit atrocious acts of genocide to accomplish their goal of exterminate humanity.
- The Vasuki, and the weapon they created named Kalakuta. They are a race of silicon-based organisms that deveoloped a weapon of mass destruction in order to exterminate carbon-based lifeforms. Kalakuta means Reaper of Carbon-Based Organisms.
- Naraka, a member of Varuna's family that has the strange ability to alter people's and the world's history in a way as if it has always been such.
