Hive Tertius is a first-person horde shooter set in a gothic hive city that is grown, block by block, from a short text recipe every time you play. You start on the highest deck. There is no way back up, only drop-shafts and grand stairs down through the dark toward the sump, and the horde never stops coming.
Gather the ichor of what you kill to grow stronger, and choose a gift each time you rise: holy weapons, burning rites that fight beside you, grafted flesh. Descend for a bigger score multiplier, through four strata: the Spires, the Habs, the Forges and the Underhive, each with its own districts, light and dangers. There are cloisters and colossal saints, molten foundry pits, and flesh nests that hatch as you pass. Golden shrine beacons offer trials: slay enough of the horde near one before the candles gutter and the saint rewards you.
Every few minutes one of the great horrors arrives: the Pale Colossus, the Brood Mother, the Bellwether.