May I present to you, the Explosively-Pumped Flux Compression Generator powered Vircactor

The best part? Not only does it sound like a Scifi-esque weapon, it's actually a real thing that exists in real life! (here's a paper about it)

A remarkably simple device that is little more than a pipe bomb wrapped in a coil of wire with one end hooked up to a glorified coffee can with and the other connected to basically a pie tin. Between the office kitchen and the janitor's closet, you'll probably find most of what you need (where the C4 comes from... that's up to you).

According to Wikipedia, Vircators have been used as [EMP] generators and for generating X-rays. Power levels on the order of [Tera]watts are possible so it'll certainly give your energy-sucking monster a hard time...

Admittedly, the one in the image at the top is a little bit big at a meter and half long and as thick as your leg, but you wouldn't need to shrink it by much to get it down to shotgun size. And as an added bonus, there'd be a massive explosion every time you fired it, I think the diagram on the Wikipedia page about flux-compression generators just about sums it up in this image...

But if you need a catchier name for them, well...

May I present to you, the Explosively-Pumped Flux Compression Generator powered Vircactor

The best part? Not only does it sound like a Scifi-esque weapon, it's actually a real thing that exists in real life! (here's a paper about it)

I know you didn't want to use flux compression generators, but seeing as people have disrupted computers simply by playing Janet Jackson, I think you could get away with a MUCH* smaller explosive charge. Just wrap some kitchen foil around one of these and call it a day...

*

For such a complicated sounding device, it's actually a remarkably simple device that is little more than firecracker covered in foil wrapped in a coil of wire with one end hooked up to a glorified coffee can with and the other connected to basically a pie tin. Between the office kitchen and the janitor's closet, you'll probably find most of what you need (where the C4 comes from... that's up to you).

According to Wikipedia, Vircators have been used as [EMP] generators and for generating X-rays. Power levels on the order of [Tera]watts are possible so it'll certainly give your energy-sucking monster a hard time...

Admittedly, the one in the image at the top is a little bit big at a meter and half long and as thick as your leg, but you wouldn't need to shrink it by much to get it down to shotgun size. And as an added bonus, there'd be a massive explosion every time you fired it, I think the diagram on the Wikipedia page about flux-compression generators just about sums it up in this image...

But if you need a catchier name for them, well...

May I present to you, the Explosively-Pumped Flux Compression Generator powered Vircactor

The best part? Not only does it sound like a Scifi-esque weapon, it's actually a real thing that exists in real life! (here's a paper about it)

A remarkably simple device that is little more than a pipe bomb wrapped in a coil of wire with one end hooked up to a glorified coffee can with and the other connected to basically a pie tin. Between the office kitchen and the janitor's closet, you'll probably find most of what you need (where the C4 comes from... that's up to you).

According to Wikipedia, Vircators have been used as [EMP] generators and for generating X-rays. Power levels on the order of [Tera]watts are possible so it'll certainly give your energy-sucking monster a hard time...

Admittedly, the one in the image above is a little bit big at a meter and half long and as thick as your leg, but you wouldn't need to shrink it by much to get it down to shotgun size. And as an added bonus, there'd be a massive explosion every time you fired it, I think the diagram on the Wikipedia page about flux-compression generators just about sums it up in this image...

But if you need a catchier name for them, well...

May I present to you, the Explosively-Pumped Flux Compression Generator powered Vircactor

The best part? Not only does it sound like a Scifi-esque weapon, it's actually a real thing that exists in real life! (here's a paper about it)

A remarkably simple device that is little more than a pipe bomb wrapped in a coil of wire with one end hooked up to a glorified coffee can with and the other connected to basically a pie tin. Between the office kitchen and the janitor's closet, you'll probably find most of what you need (where the C4 comes from... that's up to you).

According to Wikipedia, Vircators have been used as [EMP] generators and for generating X-rays. Power levels on the order of [Tera]watts are possible so it'll certainly give your energy-sucking monster a hard time...

Admittedly, the one in the image at the top is a little bit big at a meter and half long and as thick as your leg, but you wouldn't need to shrink it by much to get it down to shotgun size. And as an added bonus, there'd be a massive explosion every time you fired it, I think the diagram on the Wikipedia page about flux-compression generators just about sums it up in this image...

But if you need a catchier name for them, well...