Interdictor vessel Interdictor vessels , also known as Interdictor cruisers , were general terms for a type of starship employed by the Galactic Empire with the technology to generate a gravity well , which had the capability to pull vessels out of hyperspace as well as preventing them from entering it . Interdictor vessels could be from various starship classes , ranging from frigate s to Star Destroyer s . Models . CC - 7700 frigate . A frigate that was an updated version of the Detainer CC - 2200 . Detainer CC - 2200 . These cruiser s had stubby wing like projections , each of which housing four gravity well projectors . They were thickly armor ed and had downsloping bows . Immobilizer 418 cruiser . The Immobilizer 418 cruiser was a 600 - meter long cruiser armed with 20 laser cannon s and a complement of 24 TIE fighters and was equipped with four spherical gravity well projector s on its hull . By 14 BBY , it was considered a state - of - the - art design and was developed as a part of the Deep Core Security Zone , and would soon see use in the Obroa - skai system , although there were many technical issues with it , leading to the discontinuation of the production of the Immobilizer 418 in 0 ABY , shortly after the Battle of Yavin . However , they continued to be used throughout the galaxy due to their large numbers , with one being the " Glaciate " . " Interdictor " - class Star Destroyer . The " Interdictor " - class Star Destroyer possessed four spherical gravity well projector s on its sharp - bowed hull . These projectors were vulnerable , however , as they could explode when exposed to enough firepower . This in turn could compromise the entire ship . History . Interdictor vessels were in use with the Imperial Navy as early as 14 BBY . During the Berch Teller campaign , Vice Admiral Dodd Rancit suggested that Interdictors be used to pull Moff Wilhuff Tarkin ' s ship , the " Carrion Spike " , out of hyperspace after it had been hijacked by an insurgent group . A CC - 7700 frigate , a Detainer CC - 2200 interdictor cruiser and an untested Immobilizer 418 cruiser became part of a flotilla commanded by the moff to capture the corvette in the Obroa - skai system . However , they failed and the Immobilizer was sent back to Corellian Engineering Corporation after there were many operational issues with it . A prototype " Interdictor " - class under Admiral Brom Titus underwent testing in the Del Zennis system in 4 BBY . It pulled a rebel CR90 corvette out of hyperspace , which had been responding to a distress call in the system , capturing its crew , which included Commander Jun Sato and Ezra Bridger . This Star Destroyer was later destroyed by Captain Rex and Kanan Jarrus . Two other Interdictors were also part of the fleet of Grand Admiral Thrawn at the Battle of Atollon in 2 BBY , where they were used to great effect against the combined forces of the Alliance to Restore the Republic , preventing the Rebel fleet from leaving the system . The first , under the command of Admiral Kassius Konstantine , was destroyed when Commander Sato rammed it with the " Phoenix Nest " carrier , while the second was incapacitated through the efforts of Bridger as well as the warriors of Clan Wren , who repeatedly blasted the ship ' s Gravity well projector s to cause its destruction . In 0 ABY , production of the Immobilizer 418 cruiser was discontinued due to its vulnerabilities , though they continued to be used throughout the galaxy due to their large numbers . One managed to pull Luke Skywalker out of hyperspace into the Daalang system after he managed to free a high - priority asset from the Imperial cause . However due to the ships frequent use against Alliance raiding groups , Luke Skywalker was able to form an attack strategy against the ship , ultimately destroying the vessel by splitting it in half with a Utheel Rockcrusher Compact Seismic Charge . The Immobilizer " Glaciate " participated in the Battle of Jakku , during which it was infiltrated and captured by the New Republic operatives acting on General Carlist Rieekan ' s orders . Behind the scenes . The concept of the Galactic Empire disabling vessels ' hyperspace capabilities using Interdictor vessels first appeared in the " " 1989 supplement Imperial Sourcebook and later used in " Heir to the Empire " , a 1991 novel by Timothy Zahn that was the first in a featuring events set several years after the conclusion of the final film of the original trilogy . While this trilogy is now considered part of the franchise known as " Star Wars " Legends and no longer canon , Interdictor vessels were featured in novels such as " Tarkin " and " Heir to the Jedi " , which are considered part of a new continuity of canon .