Defensively, the Defiant class ships had shields as well as ablative armor. But the USS Defiant had one other trick up its sleeve that the rest of its class did not. As the first and only one of ...

Star Trek: Lower Decks season 5, episode 9, "Fissure Quest" introduces the Defiant Class starship Anaximander, which is investigating quantum fissures that lead to different realities throughout ...