Borg cube at System J-25
The signature vessel of the Borg Collective, this cube provided the Federation with their first glimpse of their most lethal enemy. In 2365, the Enterprise-D encountered the Borg at System J-25, following an incident with Q.
The cube possessed unique and damaging weaponry, including a tractor beam, the aforementioned cutting beam, and a series of charges that prevented the Enterprise from maintaining warp speed.
The cube sent one of its drones over to assess the Enterprise for assimilation, and later fired its cutting beam at the starship, carving a section of hull directly from the Enterprise's saucer section.