From Lexicanum

The Hammer of Justice is a Dominator Class Cruiser. It was seen during the Gothic War under Captain Grenfield. When it was outfitted, weapons batteries of greater range but lesser strength were added by mistake causing the Hammer of Justice to under perform during trials however during the Port Maw Blockade and Raid on Alios, the use of the Nova Cannon caused many other captains to replace their prow armaments due to its improved effectiveness.¹

Sources

• ¹:Battlefleet Gothic Rulebook p111