The shadow thing sighs, annoyance quickly turning to boredom.
"Why do superweapons always have a lengthy start up time..." It asks itself, rhetorically.
Soon enough, it begins humming to itself, at about thirty rells to countdown end.
"Doo doodoo, doo, doo doodoo doo. Doo doodoo, doo, doo doodoo doo. Doo doodoo, do, doo doodoo doo; doo doodoo! I'm a chargin' my attack!" It sings, as it finally beeps, signalling that it's ready for one time use. He aims it carefully at the beast, as it prepares a beam of something unknown to send at the thing, frying the weapon. It launches a beam of obviously dark magic, enhanced beyond comparison (unless one cast by an alicorn). It seems to strike the beast upon the brow, but nothing visibly happens. The thing, however can feel itself in gruesome agony, as it's mind is being torn apart, piece by psychic piece. Until all that remains is the tiny spark of existence. It's been rendered effectively brain-dead.
The shadow thing mutters, "Make me waste my last one, why don't you..." It wanders back into it's lair, sealing the porthole behind it. It has better things to worry about, than some weak-minded monster, attempting to ravage the city. The military can deal with the others, it has work to do. It has a World-Eater to summon. It has to contact the Jabberwocky. There is no "vorpal blade" to speak off, nothing to go "one-two, one-two, and through and through". Nothing to go "snicker-snack". And there are certainly no Heroes to go "galumphing" anywhere...