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 .
Steam Community Note: This build was tested on the "Caustic Lands" and "Dark Moorland" maps at 800% difficulty. Survivor rate: 94%. they are billions calliope build