They Are Billions Calliope Build Better ((free)) Jun 2026

“They are billions” is a promise of overwhelming odds. To survive, a player must not only build—they must build better. The Calliope build rejects the false security of slow, heavy defense in favor of rapid, distributed, and aggressive suppression. It teaches the player to value rate of fire over alpha damage, redundancy over brute strength, and proactive defense over reactive panic. For those willing to step away from the Ballista comfort zone, the Calliope offers a path to cleaner expansions, fewer restarts, and the quiet satisfaction of watching a wave dissolve into a cloud of blood and steam before it ever touches your walls. Build better. Build Calliope.

Shift focus to Critical Hit Chance and Area of Effect upgrades. As the density of the infected increases, she needs the raw DPS to carve paths through the undead. Conclusion

Use her high movement speed to pull small groups of infected away from the main horde. Fire a few shots, retreat, and repeat.

: Exceptionally fast baseline movement, rapid attack speed, and quick target switching. they are billions calliope build better

Understanding her base mechanics is crucial before spending your hard-earned hero points.

: Maximize her movement speed to allow flawless kiting against massive waves. 🛠️ Tactical Gameplay Strategy

The campaign skill tree for heroes offers several paths, but to build the ultimate version of Calliope, you should prioritize upgrades in a specific sequence. Focus on maximizing her offensive output and survivability through speed. Tier 1: Core Essentials (Missions 1–5) “They are billions” is a promise of overwhelming odds

Because she is faster than most infected, use her to bait Spitter attacks away from your stationary soldiers or walls.

A "better build" is not about having the most units; it's about having the most robust, multi-layered defense.

While she is already fast, one or two speed upgrades allow her to outrun "Runners" more comfortably, making pixel-hunting for loot much safer. It teaches the player to value rate of

To build a better Calliope, you must focus on her strengths: fire rate and mobility. Avoid defensive stats early on; if Calliope is being hit enough to need extra HP, you are playing her wrong.

To optimize Calliope, you must prioritize her ability to clear rooms before enemies can close the distance. Her lower health pool compared to Caelus makes "deadly speed" her best defense. Attack Speed is King