Billions Calliope Build | They Are

| Attribute | Value | |-----------|-------| | Cost | 500 gold, 2 oil (late campaign) | | Damage | High (explosive AoE) | | Attack speed | Slow but powerful | | Special | Explosive shots (damage multiple enemies) | | Weakness | Cannot target flying enemies |

⚠️ Critical limitation: Calliope cannot attack flying units (harpies, spitters, banshees, dragons). You must keep Soldiers, Rangers, or Wasps for air defense.

In the brutal, RTS-survival hybrid They Are Billions, few sounds are as satisfying as the deep, thumping detonation of a Thanatos rocket or the piercing shriek of a Lucifer’s flamethrower. However, for players looking to transition from "surviving" to "dominating" on Nightmare difficulty (800%+), there is one unit that often gets overlooked by novices but is worshipped by veterans: The Calliope. they are billions calliope build

Often misunderstood as a "weaker Thanatos," the Calliope is actually the king of wave clear and noise management when used correctly. This guide will provide the definitive Calliope Build—a strategic framework for tech rushing, economy balancing, and tactical deployment that turns this railgun-toting killing machine into the cornerstone of your final defense.

This is the expansion phase. You must claim the high-value real estate around the pit edges. | Attribute | Value | |-----------|-------| | Cost

Calliope is a trainable hero unit unlocked via the Engineering Center in the campaign tech tree.
The "Calliope build" refers to a strategy where you rush Calliope as early as possible and use her to carry the early-to-mid game, replacing traditional mass Rangers or Soldiers.

A tower does not increase a Calliope's fire rate significantly, but it does limit their firing angle. A Calliope on the ground can rotate 360 degrees instantly to shoot a Harpy behind them. On a tower, they have a slow turn radius. Keep them on the ground. ⚠️ Critical limitation : Calliope cannot attack flying

This paper describes a focused "Calliope" build strategy for the real-time strategy survival game They Are Billions. It defines goals, core mechanics leveraged, build order, unit composition, economic and defensive planning, upgrade priorities, and situational adaptations. The aim is a repeatable, efficient mid-to-late-game build that maximizes map control and survivability while keeping micro demands moderate.