Krenim weapon ship The Krenim weapon ship was a weapon developed by the Krenim Imperium some time around 2174 and constructed sometime afterwards . Its design and construction was spearheaded by Annorax , a military temporal scientist . History . Deployment . The design of a weapon that pushed targets out of the space - time continuum , and the construction of a ship to house it , was overseen by Annorax in the 22nd century . In the 2170s , the weapon ship was activated and used against the Rilnar , the primary enemy of the Krenim Imperium at the time . This temporal incursion restored the preeminence of the Krenim , but unexpectedly also resulted in a plague that cost over fifty million Krenim lives . Annorax attempted to rectify his error with a second incursion , but inadvertently erased the Krenim colony at Kyana Prime and with it his beloved wife . Annorax continued to alter history with the weapon ship over the next two centuries , obsessed with restoring his wife . Among the civilizations he eliminated were the Alsuran Empire , the Malkoth , the Zahl , the Garenor , and the Ram Izad . Use against " Voyager " . The weapon ship was also employed against the Federation starship ( Component 049 Beta in their calculations ) . " Voyager " had been passing through what in a previous timeline had been Zahl space when Annorax used the weapon to erase the Zahl , turning Zahl space into Krenim space . Attacked repeatedly by Krenim warship s using chroniton torpedo es against which their deflector shield s were useless , they were forced to develop temporal shield s to use against the torpedoes . These shields disrupted the precise calculations Annorax ' crew had made to direct the results of their temporal incursion against the Garenor . This caused the incursion to " miss " ; instead of the desired results , that is , the restoration of all of Krenim territory , including Kyana Prime , a timeline was created in which the Krenim Imperium never existed at all . This was , of course , totally unacceptable , and thus Annorax turned the weapon on " Voyager " . " Voyager " , however , was able to escape by going to warp speed , taking advantage of its faster warp capability to outrun the weapon ship . Self - erasure . The weapon ship itself was eventually erased from history when " Voyager " , all but destroyed by Krenim attacks , led a small fleet , composed of two Mawasi cruiser s and three Nihydron warship s , against it . Tired of the seemingly endless and futile mission , some of the crew , led by Annorax ' second in command , Obrist , shut down the temporal core . This caused the ship to phase back into normal space time , so that conventional weapons could affect it . Though the vessel ' s conventional weapons were limited , they were still enough to overpower the attackers . However , " Voyager " s captain , Kathryn Janeway , was aware of the exact location of the ship ' s temporal core . Alone on her ship after being forced to order the rest of her crew to abandon ship due to its ruined state , she piloted it into that section in a kamikaze attack , causing the core to destabilize . This exploded the weapon ship and , moreover , caused a temporal incursion that erased the ship itself from history , and with it , every one of the alterations in the timeline it had ever made . Ironically , this had the effect of accomplishing exactly that which Annorax had been attempting to do for centuries ; Kyana Prime was never erased , and Annorax never lost his wife . ( ) Technical data . Method of operation . Its main weapon was a beam that pushed objects out of the spacetime continuum , effectively erasing them from history . Careful and meticulous calculations were required to create the exact changes in the timeline that were desired . The ship could be deployed against an entire species by firing the weapon on the species ' homeworld , pushing the species out of the spacetime continuum . This caused a causality paradox ; all of history the species played any part in would be altered . The following gallery is an illustration of the method of operation , in which the weapon was used against a colony . Capabilities and limitations . The ship obtained its power to affect time from its temporal core . When in operation , the core also kept the ship , and everything and everyone on it , outside of normal space - time . This rendered the ship immune to all conventional weapons and protected the crew from the flow of time , effectively rendering them immortal . Without the temporal core however , the ship was vulnerable as its shields were so weak that even a photon grenade could penetrate its hull . In addition , the vessel ' s great mass prevented it from exceeding warp 6 . The ship did mount a formidable array of directed - energy weapon s for conventional warfare . ( ) Apocrypha . The " Star Trek Online " mission " Time in a Bottle " reveals that the Krenim are aware of the events that befell Annorax , and offer the Delta Alliance ( the Federation , the Klingon Empire , and the Romulan Republic ) a set of schematics for the weapon ship to be used against the Iconian s ; in " Broken Circle " , the Alliance makes an attack against the Iconians to give the researchers time to complete the ship . In the mission " Butterfly " , the ship – christened K . I . S . " Annorax " – is completed , but the researchers reveal that using the weapon directly against the Iconians would result in the discovery of warp travel being delayed for more than 50 , 000 years . After holodeck simulations to determine an ideal scenario , the ship makes a temporal incursion that restores the destroyed planet of Romulus , but finds it has been completely assimilated by the Borg . The ship is thus forced to make another temporal incursion , this time against the Borg transwarp network ; the ship is damaged by Borg attacks and its temporal shielding fails , reintegrating the ships and their crews into the " main " timeline . The " Annorax " also plays a major part in " Midnight " , the final mission of the Iconian War storyline , opening a portal to allow the player character to go back in time and somehow stop the Iconians . In the Future Proof storyline , tying into the " Agents of Yesterday " expansion , the Krenim lead researcher Noye hijacks the " Annorax " , allies with the Na ' kuhl , the Vorgon s , and the Sphere - Builder s , and attacks the signing of the Temporal Accord . He later augments the ship with Sphere - Builder technology . In " Ragnarok " , the final mission of the storyline , Noye commands the " Annorax " at the Battle of Procyon V ; after the Sphere - Builders ' spheres are destroyed , the player disables the " Annorax " , boards the ship to disable its temporal core , and captures Noye . The ship was later made available to players as the " Annorax Science Dreadnought " .