Oops... I don't want to be in that mothership- or in the city below, for that matter. Something as big as that is going to make a pretty big boom just from sheer impact- kind of an extreme, kamikaze version of kinetic bombardment from orbit. Nice work!!
The casualty....... that must be high-rocketed top notch. Not to mention after effect radiation. Great work on this really make me shiver all night if this really come true.