"I found the key!" Vane called to him as he was completing his grim task, holding up the iron key with a certain sense of vigour. But this time, as Eldarin drained the blood, something snapped into his head... a vision began to play out before his eyes as the blood passed into the glass container. 
He saw snapshots through the eyes of a soldier, a guard of this old temple, performing simple duties and protecting the place. He saw the guard captain, recognizable by his scimitars, barking orders at them and becoming increasingly stressed out with their job. Then, came the goblet of water... laced with the black ichor from the river he had seen. He felt the guard drink it and felt time pass as the effects took hold. The visions ended as he saw the entire troop being pulled into a singular being with the captain screaming about responsibility, the vision ending as flesh and steel became one.