You can only use Calliope during specific marked on the campaign map. You cannot train her from a Soldier Center in standard survival or defense missions. Step 1: Select the Tactical Mission

, addressing her primary weaknesses—low base damage and short range. Feature Concept: "Echo of the Sisters"

Focus your early perk points on damage to hit the key breakpoints, then build for survivability and speed. Your greatest weapon is not just her twin pistols, but your ability to stay in motion.

When playing tactical hero missions, Calliope requires a specific operational approach to ensure maximum resource extraction and safety.

: Permanently increases base attack damage, helping her one-shot basic infected. Tier 3: Late Game Survival

This is her bread and butter. Calliope relies on a high volume of fire to stun-lock small groups of runners. Maxing out her fire rate ensures that nothing gets close enough to touch her paper-thin armor. Movement Speed:

Pick up at least one and one Reload Speed (+40%) perk.

to kite hordes. A common consensus among experienced players is that a viable build must balance damage to reduce the number of shots required for kills with enough health/armor to tank at least one surprise hit. Core Build Priorities To optimize Calliope, prioritize these stats in order: Attack Damage & Range

The wrong build can leave her completely outmatched, especially against Harpies. This optimized build order will turn her from a liability into your greatest weapon.

They Are Billions "The New Empire" campaign, is the agile, rapid-fire hero designed for hit-and-run tactics

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Calliope ’s native attack range is dangerously short. Advancing through the Improved Vision nodes keeps you safely away from Spitter goo and gives you a head start when kiting rapid Runners.

Keep 10 Rangers on "Chase" mode behind her. When she backs up from a horde, the Rangers catch the stragglers. This synergy keeps her repair bill low.

Mastering the Apocalypse: The Ultimate They Are Billions New Calliope Build

base) to "kite" hordes. Never stand still if a large pack is approaching, as her low health ( HP) makes her extremely vulnerable to being overwhelmed. Hero and Perk test results - They Are Billions

Have you found Calliope in your current survival run? Don't wall up. Gear up. Go kill that Giant.