The Symbol

[The material used for the crystal should be easily accessible in this area; otherwise, they wouldn't use it for all their construction.] 

[But I doubt they use blood. Currently, King's blood has a high concentration of Life Force energy, so a single drop is enough, but for normal beings, their concentration will be far lower, so if they really use blood to activate this many items daily, it will require much blood killing many of them, or they need to capture other sentient being for this.]."

Alex realized Vesa was correct, based on everything he had seen so far; the people here seemed to be a tribe that liked to live peacefully; he hadn't seen anything that looked like a weapon. 

He then took out a bottle of the spice water and started dripping it into another shard of crystal. To his surprise, the crystal reacted just the same as when he dripped his blood on it.