Do you have any specific Calliope or early game challenge that you're currently facing? I can offer more detailed tips if you share where you're getting stuck.
Calliope is the fastest, most agile hero in They Are Billions . Her high mobility and rapid-fire dual pistols make her an exceptional crowd-control specialist in tactical campaign missions. However, her lower health pool and shorter attack range mean a poor build can leave her easily overwhelmed by infected swarms.