Theorycrafting time:
Hp 600, Shield 300, Defense 5
Psionic resist: 45
Kinetic resist: 15
Electric resist: 15
Thermal resist: 15
Freezing resist: 15
Corrosive resist: 15
Shield resist: none whatsoever
Attacks:
Psi Scream: Stun (Willpower save)
Wing Buffet: Blind (Physique save success), Blind + Trip (Physique save fail)
Psi Miasma: Reflexes & Aim debuff (Willpower save)
Tail Slap: Kinetic, one big hit
Psi Bolt: Freezing, one big hit (Willpower save)
Rend: Kinetic, three small hits
Psi Barrier: Self buff, defense + Psi attack buff
Welp, this is gona be quite the battle. From what i can see, here are my observations:
Max out your willpower before attempting. Half of this guy's attacks involve willpower saves. Get Physique high as well, unless you have the stand up perk from smuggler.
Flash Goggles go without saying, since his status attack will inflict blind regardless of save. Again, thermal undies without saying.
Kinetic is probably preferable over freezing resist for this. All things considered, Weavemail coat is probably your best bet.
No special resists. NO MIRRORED TAG!!!. Bring your favorite gun and go to town.
Reaper Shield is probably preferable over Arctic Warfare because you'll see more kinetic attacks then freezing.