Liberating hostile alien planets is not an easy job to do in Helldivers 2. You not only need to rely on your friends in co-op but also your ability to call in powerful stratagems that can (and will) leave the planet in ruins. Whether that requires summoning airstrikes to drop explosive payloads, directing orbital barrages, or deploying sentries, you will need every stratagem at your disposal to gain an upper hand while fighting the Terminids and Automatons.