Hyrein/Abilities

His black trigger ability allows him to create animal-shaped trion bullets. These bullets turn anything made of trion, including other trigger users' trion bodies, into helpless compressed trion cubes. His trigger consumes a lot of trion, which hints that Hairein has a large trion capacity.

Although the animal bullets are useless against anything that isn't made of trion, Hairein has a fine degree of control over their movements and can freely choose what shapes to create, allowing him to easily bypass defenses and overwhelm several Border agents. The compressed trion cubes only revert to their normal forms once Hairein is defeated.

Intelligence
Hairein is certainly an intelligent individual. He planned to target the C-Rank agents, knowing their increased vulernability. He also demonstrated incredible ability to analyze opponents' Triggers and applying effective countermeasures.