In the grim, infected world of They Are Billions, the Calliope stands out as a unique Commander—one who trades raw firepower for control, sustain, and terrifying efficiency. Her namesake, the steam-powered calliope, hints at her playstyle: a relentless, rhythmic pressure that grinds the infected into paste. To "build better" with Calliope means embracing her as a force multiplier, not a one-woman army.
In the steampunk apocalypse of They Are Billions, survival often comes down to the specific tools you bring to the battlefield. While Lucius offers raw power and Caelus provides economic utility, the mercenary known as Calliope brings something far more rhythmic and destructive: the power of music.
Playing as Calliope requires a fundamentally different approach to base building compared to other units. Her unique mechanics turn the defensive lines into a coordinated orchestra of death. If you find yourself overwhelmed by the swarm, it might be time to let the Banshee wail. Here is how to execute a "Better Calliope Build." they are billions calliope build better
The Optimal Build: Surround your Conservatory with:
If you place Calliope next to a Conservatory, you unlock a hidden efficiency: Her slow aura extends to any building within 4 tiles, reducing the maintenance cost of those structures by 10%. This is not documented in the tutorial, but it’s confirmed in the game's logic files. In the grim, infected world of They Are
Better Build Strategy: 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.
The Stacking Effect:
Infected move at 20% of their normal speed. A Chubby (Fat infected) that usually takes 10 seconds to cross a killbox now takes 50 seconds. That is 40 extra seconds for your Thanatos rockets to reload and your Executors to fire 40 more shots.
Standard meta says you need Ballistas by Day 15 to hold medium chokes. With Calliope, you can delay Ballistas until Day 25. If you place Calliope next to a Conservatory,
The Calliope’s genius lies in its high rate of fire and surprisingly low energy cost. Firing multiple projectiles in quick succession, it excels at “crowd suppression”—shredding the health of dozens of infected simultaneously rather than killing one at a time. When paired with a single layer of wooden wall, a single Calliope can hold a chokepoint against early wave compositions that would overwhelm two Ballistae. Its sound profile, while notable, is no louder than a Ballista’s thrum, and its rapid hits stagger and slow advancing enemies, buying precious seconds for repair or ranger support.
More importantly, the Calliope enables a distributed defense network. Because it costs roughly the same stone and wood as a Ballista but requires less gold upkeep, players can place three Calliopes at key angles instead of two Ballistae. This redundancy is life-saving during surprise attacks from undetected directions. Furthermore, the Calliope’s compact footprint allows it to be squeezed between housing blocks or behind double-layered walls, creating overlapping fields of fire that a Ballista’s narrow arc cannot match.