man this is literally what happened during the War of the Beast! the orks had a weaponized moon they were threatening Holy Terra with! i'm dead certain this is probably the exact words some ork said when he saw the thing.
Have to ask. Is this the first Death Star with its eight main reactors that all have to be used to blow up a planet then can't first for 24 hours. Or the second one that has more then eight reactors allowing it to fire faster then the first...?
Crash a few Imperial Destroyers into it for the spikey bits. Paint it red to make it go fasta, or blue to make it work betta. And those reactor vents? They should be venting ignited plasma.
Blasphemy! I quote:
"AN' DERE AIN'T NO SUCH FING AS ENUFF DAKKA, YA GROT! Enuff'z more than ya got an' less than too much an' there ain't no such fing as too much dakka. Say dere is, and me Squiggoff'z eatin' tonight!"
I think War of the Beast had similar premise where they made Attack Moon.
Like Deathstar but more powerful and even managed to stop Luke Skywalker army by “blinking”, turning into pool of blood.