Krenim warship

The Krenim warship, created by a temporal incursion that altered the timeline, was used by the Krenim Imperium to defend their expansive empire from all invaders. These ships use chroniton based torpedoes that are capable of penetrating Starfleet shields as they are out of phase with the rest of space time. The U.S.S. Voyager was eventually able to develop a defense against these weapons but not before losing a majority of the ship. After the Krenim weapon ship was destroyed and the timeline restored, the Imperium continued to use the warship.