D-033 is not immortal.
- While the demon's carapace is insanely durable it can still be killed. One of the possible ways could be electrocution. Or extreme heat or cold. The carapace may not be able to protect its squishy insides from these influences, which simply pass through without affecting it. It could also be possible to Feed It a Bomb, which would result in a shell full of mush. Last but not least, some experimental weapon working with exotic particles akin to the Tau Cannon could also do the job - again the carapace wouldn't be able to stop these exotic particles, which in turn would fry the demon's insides to a crisp. Radiation might also do the trick although it might take more time.
