Instead of putting Calliope on your front wall, build a secondary "Cultural District" behind your main housing block. Place her there during non-wave days. Her passive slow prevents infected who break the outer wall from sprinting through your houses, buying your Rangers 5 extra seconds to respond. You are effectively using her as a living firebreak.
In campaign missions with ruins (buildings), hide Calliope inside a destroyed doorway. The pathfinding in They Are Billions will make zombies crowd the single tile entrance. Place Calliope 2 tiles back. She will shoot through the doorway, piercing the entire crowd. they are billions calliope build better
In the tactical hero missions of They Are Billions is often viewed as the higher-skill, high-reward alternative to the tanky Caelus. While she possesses superior movement speed and rapid fire, her low base damage and short range make her vulnerable in the late game unless built with extreme precision. To "build better" with Calliope, players must prioritize damage thresholds and range over utility stats like reload speed or health, transforming her from a vulnerable kiter into a lethal skirmisher. The Core Priority: Reaching Lethal Thresholds Instead of putting Calliope on your front wall,
If you find yourself forced to choose between health and armor on the skill tree, always choose Strength IV (+50% Life): You are effectively using her as a living firebreak
Many players treat Calliope as a standard sniper, only to watch her get overwhelmed by the first Spitter that appears. But if you learn how to with Calliope, she transitions from a liability into a one-woman army capable of clearing entire swamps solo.