In the strategy game They Are Billions , players face grueling tactical hero missions during the campaign. Choosing introduces a fast, nimble gunner who utilizes dual pistols to easily clear rooms through precise kiting. However, her low base damage and short attack range make her incredibly vulnerable to high-tier infected like Harpies and Spitters.
Early on, she struggles against armored or high-health targets like Chubbies.
Lastly, you need to research the Calliope technology in the Research Tree. This will unlock the blueprint for building Calliope and allow you to start constructing it.
Kill them before their acid can melt Calliope's low armor.
Prioritize picking up resource crates (wood, iron, gold) dropped by destroyed infected buildings to instantly boost your colony's growth. Phase 3: Late-Game Fortress and The Wave Defenses
Once your Wood Workshop research is complete, construct a Stone Workshop. Your research priorities should shift to:
Calliope is fundamentally different from her counterpart, , who is a heavily-armored, slow-firing tank. Calliope is an agile scout and a rapid-response killer. She wields The Devil's Sisters, dual pistols characterized by very low damage per hit and short range, but an exceptionally high rate of fire. This makes her incredibly effective at clearing large numbers of weaker infected but extremely vulnerable to tough, fast enemies like Harpies. As the developer notes, she is "frankly a bit squishy".
While not necessary immediately, a point in AoE can help manage dense packs of weak zombies later. Surviving the Late Game (Level 11+)
Your main goal is to rapidly expand. Use Calliope's speed to clear nearby zombies. Use the "Patrol" feature to set her on a loop around your perimeter, automatically killing any stray infected that wander too close. Work toward a population of 200-300. This economy will fuel your entire operation.