You play as a newly recruited Neuron Officer tasked with combating this ongoing threat, along with your fellow cast of colourful teammates, including your twin Akria (based on being the opposite sex to what you as the player chooses). This task force is unique as they utilise “Legions” as their main attack against the ongoing Chimera threat and stand as civilisations last chance at putting an end to this war.
To put it simply, Legions act kind of like Pokémon in a sense as they are chimeras that have been captured and bound to officers via a psychic link, changing their colour palette from dark reds to deep blues, which enables them to be used for combat and investigation purposes. A small detail that I loved with this is the way your legions kind of fidget in place as if they want to break free but cannot, not a major detail but it added to the immersion of this creature being bound against its will to fight at your side.
Astral Chain is unique as it is an action-heavy game, which is to be expected from the team who made Bayonetta, but at the same time, there are many prolonged periods of time when you will not fight a single enemy, which helps to break up the monotony of combat.