The Singularity Cannon which is available in the last level of Unreal II known as Dorian Gray. This weapon serves as the alien Tosc's primary weapon. Unlike all other weapons in Unreal II, the Singularity Cannon is not meant to be picked up and fired by anyone; it is physically attached to each Tosc and has to be blown off the right arm of the first Tosc that John Dalton encounters aboard the Dorian Gray.
The Singularity Cannon fires one round at a time, starting with 1 loaded and 666 in reserve. It must be prepared for each shot, but since a single shot from it causes more devastation than a Rocket Launcher, that one round is something to be reckoned with.
The Singularity Cannon's shot is not a rocket or bullet. Somehow the weapon seems to generate a miniature black hole that exists only for a short time. It does not damage a target directly, like even the Redeemer, a compact guided nuclear missile launcher, does. Instead, the miniature black hole it generates is projected towards wherever the Cannon is pointed. It then pulls everything within its reach towards itself, leaving only a slim chance of escape. Anything or anyone pulled in is never seen again.
Great care must be taken when using the Singularity Cannon. The compact black hole it generates each time it fires does not discriminate, and will take John Dalton with it if given the chance. Never fire at anything close by. The Singularity Cannon is extremely dangerous to anyone close up and must be used only at medium to long-range. The Tosc themselves recognize this danger posed by the Cannon, as evidenced by the fact that they do not fire it when Dalton or a Marine gets close to them, instead resorting to melee combat.