Helps with clearing packs faster.

New players queue up 20 move commands and let the AI handle it. Never do this. Calliope needs frame-perfect stutter-stepping. Manual control only.

This is the most critical decision in the Calliope Build. Your campaign perk points are limited, and choosing the wrong upgrades can leave you facing an impossible mission. For a dominant Calliope Build, the strategy is clear: You must enable her to eliminate key threats before they can close the distance.

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.

To make her viable in the mid-to-late game, your skill points should be allocated in this priority: Attack Speed & Reload:

Calliope isn't meant to be a wall; she’s a scalpel. A solid build focuses on Attack Speed

If you move Calliope through the fog of war, you will trigger a Voilé cascade (chain aggro) that pulls every infected from two screens away. You will die on Day 12.

Because Calliope has a low base HP pool (60 HP), flat health increases provide a much more reliable buffer than armor percentages. Armor (+15%):

Before building a Calliope, ensure you have:

Her strengths are:

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

Calliope’s violin isn't just music; it’s a dinner bell. Her attack generates than a standard Ranger shot and 150% more than a Soldier. This is the #1 reason players fail with her.