Because of its triangular shape, the Immobilizer 418 Interdictor Cruiser is often mistakenly identified as a Star Destroyer. In fact Sienar used the hull design from their Vindicator Heavy Cruiser as a basis for the Immobilizer precisely for that reason. Immobilizers are specialized ships equipped with four gravity well generators that simulate large planet-sized masses, the purpose of which is to draw craft out of hyperspace or prevent ships from engaging their hyperdrive and fleeing a battle.