: Drastically reduces the time it takes to down Harpies and Spitters.
: Harpies are her greatest threat. If you cannot kill them at range, use a medkit immediately after the first hit or pre-fire a grenade in their path.
Focus your skill points on mobility and rapid target elimination. Calliope thrives when she can outrun infected packs and pick off high-priority targets.
In a typical 100-day survival run, the first wave (day 20) is small: 30–50 infected. A Ballista build kills them but leaves the player with no mobile defense. A Calliope build, by contrast, preserves the rangers’ stamina and allows the player to continue expanding outward during the attack. The second wave (day 35) introduces runners. Where a Ballista wall would break if the runners concentrate on a single tile, a double Calliope emplacement will mow down the wave before it reaches the second wall layer. Post-wave, the Calliope’s low repair cost (no oil, no advanced components) means the colony can immediately repurpose its stone for a Foundry or a second Command Center.
Increasing her range allows you to "kite" (attack while retreating) more effectively, keeping her out of the reach of Harpies and Spitters. Tier 3: The Game Changers they are billions calliope build better
: Increases her baseline damage-per-second (DPS) drastically, allowing her to gun down crowds before they reach her. Phase 2: DPS and Firepower Amplification (Missions 4–6)
Calliope does not have an active ability, but she has a hidden "Execute" threshold. Against basic infected, if their health is below 15%, her crit rate doubles. Do not waste a second shot on a zombie at 1 HP. Let bleed damage (if you took the perk) finish them, or swap targets.
: Calliope’s health pool is too low for armor to make a meaningful difference. If she gets surrounded, armor will only delay her death by a couple of seconds.
While Calliope is clearing the front lines, your colony must be growing at the back. This build order focuses on rapid economic and technological expansion, leveraging the time your hero buys for you. : Drastically reduces the time it takes to
If you'd like to dive deeper into her specific mission strategies, I can help you with: tactical mission order for early points. A comparison of her vs. for high-difficulty runs. Detailed walkthroughs for missions like The Foundry The Last Bunker
Building better stats is worthless if you control her poorly. Here is the pro-level micro guide for Calliope.
Choose the mayor that boosts economy (e.g., +8 gold per tent or increased worker housing capacity). 3. Mid-Game Strategy: Teching and Defending (Days 20–50)
UI & Balance Notes
: Essential for kites, kiting loops, and escaping tight corners.
They Are Billions is a relentless survival strategy game that forces players to manage resources, construct robust defenses, and command armies against overwhelming swarms of infected. For many, the (and the hero herself) serves as a challenging turning point in the campaign, demanding a shift from basic colony management to high-level strategic planning.
Now, pause the game, adjust your build, and go reclaim the wasteland.