Lucien finally realized what was going on there. The dwarves thought that he was their God of Steam, the master of life and death, and they were worshipping him.
This was Night Highland, once under the control of the dwarves, but later they were conquered by the vampires.
They should be from the last group of dwarves left from the Civilization of Steam, and they were raised by the vampires as labors.
These dwarves managed to escape from the vampire and found the relic left by their ancestors. They thought that the teleportation circle was an altar, and they misunderstood the material left by their ancestors when they tried to learn magic as the instruction for reaching their God. In this case, he was sent here when the dwarves were carrying out their rite.
It seemed that the vampires killed by him were here to kill the dwarves, and thus the dwarves, after witnessing his power, firmly believed that he was the God of Steam.