This page explained in detail about Chapter 1: The details of the "Scorpion Sentinel" bosses that appear in the Mako Reactor 1, as well as a battle guide.
This is put together for the difficulty level hard. There may be changes in behavior and behavior with other difficulty levels.
The battle reference video is in the middle of this page.
They will use a shockwave of current at the start of the fight.
You can do damage on the Counterstance.
・Target marker
It will attack your marked companions for a while. Switch to another companion and concentrate on the attack.
●2nd Level (HP Gauge from about 80%)
・Added a Field Generator to the target.
Switch your target to the Field Generator and shave off damage from the front or back until the barrier is lifted.
Activate the EM Field. If a blue current appears from the enemy, guard or avoid it out of range.
・Mark 99 Launcher
You can cancel the behavior by giving Thunder-type magic while activating it (not while in a barrier)
●3rd Level (HP Gauge from about 40%)
・Tail Laser
Use it only when there are obstacles. Hide behind obstacles to prevent damage (Hard difficulty is continuously activated until all obstacles are destroyed).
After all obstacles are gone, tend to concentrate on the last targeted companion with your laser. Thoroughly attack the monster with your non-targeted companions.
●4th Level (HP Gauge from about 20%)
・Right leg and left leg added to target.
This is the last stage, so let's fight as hard as we can.
The caretaker ignored both legs and used Sandaga to concentrate on just the main body and defeated.