Or doing magic the high-tech way. In this version of the Pentacle of Power (see Nemesis rulebook) the amateurish chalk sketch is replaced with a homemade optical bench and properly calibrated beam-splitter rig and five prisms, upgrading the original student seance antics to full-blown functionality. The operator also needs a jar labelled Dust from ye Tombe of ye Mummy (prop. Winchester Road Crematorium).

The pentacle is using a fifty kilovolt HT power supply and some mucking great capacitors to drive the laser. The operator also needs a flayed goatskin. A half-eaten pizza whirling round at 33 rpm on the Linn Sondek turntable is optional. Next to the distribution board with the circuit breaker are some capacitors that thing that are the size of a compact washing machine. The main cut-off switch is a huge knife switch on the rack above the PSU (You can leave 'em with their terminals exposed and they'll pick up a static charge out of thin air; after half an hour, if you stick a screwdriver blade across them you'd better hope the handle is well-insulated because you're sure as hell going to need a new screwdriver, and if the insulation is defective you'll need a couple of new fingers as well.)

Powering up the Pentacle
The HT power supply starts emanating the smell of ozone and makes ominous crackling sounds. The speakers (black monoliths from the 2001 school of hi-fi engineering) starts making groaning/ squealing noises. A blue-white flickering appears inside the PSU.

A loud clunk and a simultaneous bang is heard from the PSU. Magic smoke comes out of the PSU and forms a thin coil in midair, swirling in an unnaturally regular donut below the single swinging light bulb. A faint laughter echoes from the speakers.

The guests have arrived.