Mars Class Battlecruiser

Lexicanum says Forge Worlds stopped building ships of the Mars class. In which case, Imperium makes a huge flakking mistake. All in all, Mars Class has two lance turrets, two flight decks, two macrocannon batteries and, most importantly, Nova Cannon (highlighted). Nova Cannon is not very reliable, though. But for each battle in which blast scatters away doing nothing, there will be a battle when it lands right in front of a pair of Eldar escorts and turns them both inside out before they even get identified.
This certain Mars-class, named "Lord Solar Macharius" (After a Dictator-class cruiser from "Execution Hour" and "Shadow Point" books) has an Inquisition favour. This means it can identify a selected warp signature and has +1 to all crew members' levels.