Sins of the Gothic Galaxy is not endorsed by Games Workshop and does not reflect the views or opinions of GW or anyone officially involved in producing or managing Warhammer 40K. As such, it does not contribute to the official narrative of the fictional universe, if applicable.
Lances are powerful ship-to-ship weapon. Good choice against everything smaller than battleship.
Developer note: place them behind your macrocannons and before torpedo platforms. This is the main type of fire support platform in service of Imperium of Man.