Kings Blood is a blood styles scenario. Buy unit spawns with your king for stone and kill the enemies kings to win. You get stone from kills and razings. Kills also give upgrades to your units, while razings gives building villagers and defensive upgrades.
Your king can buy normal unit spawns (Tower Spawns) and unique unit spawns (Castle Spawns). Players are limited to only 10 tower spawns, but unlimited castles spawns. Castle spawns are more expensive and spawn civ-unique units. Civilizations have been balanced so the elite unique unit upgrade is achieved at different number of kills for every civilization and the unique units spawn at different rates.
There is a total of 64 tower spawns and 20 castle spawns on the map. Basic tower spawns in player bases and siege in middle.