Crux

Long ago the Crux had a pocket stellar domain at the edge of
what would later be known as the Calixis Sector. Their planets
were one by one razed to the mantle in a brutal campaign by
Admiral Jocardis the Penitent. Only the shipboard weapons
captured by boarding parties during the war remain of the
race now, with several such weapons now priceless relics in the
armories of the Rogue Trader houses of the Koronus Expanse.
These glossy black rifles emit a ray of crackling purple light
which tears open solid mass. Had the Crux been able to develop
these devices into macro weapons for naval combat, the later
history of the Angevin Crusade may have turned out quite
differently. Beam guns still occasionally appear for sale and
many were adapted in earlier centuries to use Imperial pattern
lasgun clips (although they burn out the clips completely within
a few shots). Without fail, they are traded for vast sums.
Basic, 80m, S/3/–, 2d10+5, E, PEN 6, Clip 25, RLD 4Full, Scatter, WT 4kg, Near Unique