– Pushes her fire rate to machine-gun levels. 3. Late Game (Missions 7+)

The best to complement a Calliope choice

With basic defenses holding the line, send Calliope deep into the map to hunt down (infected towns).

Trapped between the fire and the dead, Calliope’s kicked in. Her attack speed doubled. She became a whirlwind of obsidian glass and carbon fiber. As the Giant lunged, she slid between its massive, decaying legs, planting a high-explosive canister—a gift from the Engineering Center—into its heel.