Now you have to put a Yamato Cannon on it:
"No discussion of the terran battlecruiser is complete without mention of the legendary Yamato cannon, a devastating plasma weapon with enough firepower to decimate cities. Mounted on the ship's prow, the big gun draws its intense power from the ship's power core, and then uses an intense magnetic field to focus a controlled nuclear explosion into a cohesive beam of energy. The cannon is so massive that it requires its own conversion generator and a dedicated fire-control station manned by nearly 100 gunnery specialists."
- Dominion Marine Corps Combat Handbook: Infantry Edition (excerpt)