During the later stages of the game, when you have unlocked terminator armor and have to hold off the tyranid assault in anticipation for the final battle;
Equip your Force Commander with terminator armor, and give him a teleporter, the orbital bombardment and drop pods. Give him a thunder shield and storm hammer. It is incredibly easier still if you have the double bombardment skill.
Have your three best squads with him; I suggest Davian Thule with the Assault Cannon Barrage ability, Tarkus in terminator gear with a flamer, and Avitus in terminator gear. Ensure you have between your three squads the following accessory:
- Rites of Repair
- Recovery Stimulant Kit
- Cyclone Missile Launcher
- Locator Beacon
Start a defense mission on Meridian - Capital Spire, and drop down all the available Tarantula Turrets (including the ones provided with your locator beacon). DO NOT place any mines. Set up your squads and play through using these tips:
- Teleport between the various strategic points and capture them using your Force Commander. It is usually at these areas that the Tyrannids will group, so by taking them out you push further towards a 5 star fury rating.
- Use Orbital Bombardments on larger groups, but be sure to teleport out of the way. On smaller clusters, use drop pods.
- Keep an eye on your base. Use the Cyclone Missile
Launcher, Assault Cannon Barrage to take out large groups of Tyranid, and keep using stimulant kits to heal your men, and rites of repair to heal Davian and the generators/turrets.
- Kill as many Tyranid groups not involved with the assault using your Force Commander. If your commander is weak, teleport him away to let him regenerate. If he can not teleport, use the Rosarius to grant temporary invulnerability.
Ideally, you should complete the mission in about 5 minutes, and should only find small groups at the three strategic points on the map. If you have captured the shrine on the opposite side of the map during another mission, there will not be a large group defending it, else save an orbital bombardment for here.
You should easily defend your base, as the Tyranids swarm with smaller units that area easily destroyed with the various area damage skills mentioned above. If you can bring your Force Commander back in before the last strike, even better.
For the last strike, throw everything you have left at them, and pop a Rosarius for the final boss for good measure.
This tactic is also handy when you have limited time to complete missions. A 15 star rating is a full bar of experience, which in turn grants you both additional deployments regardless of Automated Foundaries on the planet, allowing you to get extra missions done in a single day so you do not get over run.