if it uses tacnuke, then it is very simple to kill it, just buy radiating coils to protect yourself from the prox, and stay a fair bit off occasionally firing a couple shots at the levi, once it fires a tacnuke, whether you dodge it or not, get in real close to it, but not close enough for it to gun you, and gun the !@#$%^&* out of the levi, it wont be able to hit you with its weak l3 guns and if it tries to tacnuke you, it will just kill itself.