It only shaves off 20% of Specimen H0512's HP until you get to the second level, so ignore most of it and aim for the main body.
・Destroy the Left Claw.
Destroying the left claw will always put you in a Pressured state. Use Cloud's Focused Thrust to build up your Burst Gauge and attack at once.
After a certain amount of time, the Left Claw will be restored. This Left Claw destruction is recommended because it works until the third and final level.
・Strike & Scratch
Basically, this boss's attacks are slow to take a stance and activate, so it's easy to turn to the guard.
I recommend the Cloud's Guardcounter or Counterstance.
・Seize
I'll catch them by hand. Switch to your friends and attack with your skills to break the restraints.
・Noxious Expulsion
It spins and scatters to deal damage plus poison.
Stay far away and attack with Barret's attack.
●2nd Level (HP Gauge from about 80%)
Attack in the same way as in the first stage.
・H0512-OPTα
As with the first level, I recommend ignoring it and aiming at the body.
●3rd Level (HP Gauge from about 40%)
・H0512-OPTβ
Be careful not to get too close or it will self-destruct. If "Apoptosis" is displayed above your head, move away from the area to reduce the damage.
・Mako Expulsion
Evolve further from Noxious Expulsion (heavy damage + poison + slow)