Hexagraphe

The Hexagraphe is an Eldar Technology that is powered by a psyker. It resembles a perfect sphere, little bigger than a child's skull, flawlessly smooth and absolutely black and it appears to absorb light rather than reflect it. When attacked by a Psyker using their witchfire, the Hexagraphe will absorb the energy and utilise it before detonating. After the detonation the psyker (if he or she has raised their Psyker shield in time) will be imprinted with psychic knowledge of the surrounding area, all living beings and the topography of the surrounding area upto many dozens of kilometers. It essentially imprints an extremely detailed map on the Psyker's mind. The Deathwatch were known to have used one such device on the mining planet Chiaro. The device had been captured from the Eldar under unknown circumstances.