The USS Antechrist (NCC-99153) was the lead ship of the Antechrist-class carrier. As such, it was on active duty in Starfleet in the 25th century. (Star Trek: False Vacuum)
It was built at Salazaar Shipyard and its first commanding officer was Daisy Pammant. It was first deployed over Vrauzon as a rescue mission performed after an asteroid impact, which saw its EMH, Charlotte, being deployed. (Star Trek: False Vacuum: "Asteroid Dusting")
It had two Caspian-class runabouts attached to the ship: the USS Monogahela and the USS Richelieu, which were used as mobile command centers for fighter wings.