Fully upgraded terminator does 3680 damage normally buy crit hit gives +100% increase in damage .Let's assume trickster lvl 18 which means 95% of double armor is active. So, your effective health is 1.95*3000 = 5850 hp. Since you have 36% armadillo, so damage inflicted = 3680(1 + 0.64) = 6035 hp. Maybe that's why terminator one shots you . If you had 42% prot armadillo you would have survived,