On the first form, it changes after he uses one of his unique elemental skills.
-At the start: [Null: Gun; Absorb: Death, Mind]
-After using his Fire skill: [Frail: Ice; Strong: Phys; Null: Gun, Death, Mind; Absorb: Fire]
-After using his Ice skill: [Frail: Force; Strong: Phys; Null: Gun, Death, Mind; Absorb: Ice]
-After using his Elec skill: [Frail: Fire; Strong: Phys; Null: Gun, Death, Mind; Absorb: Elec]
-After using his Force skill: [Frail: Elec; Strong: Phys; Null: Gun, Death, Mind; Absorb: Force]
On the third form, it changes after he comes back from using his long range attacks (like Judge Eye). Of the four patterns he chooses, it's random.
-At the start: [Frail: Fire]
-Pattern 1: [Frail: Ice; Strong: Phys; Null: Gun, Death, Mind; Absorb: Fire]
-Pattern 2: [Frail: Force; Strong: Phys; Null: Gun, Death, Mind; Absorb: Ice]
-Pattern 3: [Frail: Fire; Strong: Phys; Null: Gun, Death, Mind; Absorb: Elec]
-Pattern 4: [Frail: Elec; Strong: Phys; Null: Gun, Death, Mind; Absorb: Force]