Djinn
Hao Xuan gave the others some time to get ready.
He went inside the giant tree trunk and inspected the living spaces of each barbarian just to make sure none of them had been affected by the creature already. That was how it operated, it could get into people's heads and make them do things they would normally never do.
And more often than not, the infected individuals would start to make symbols and write strange things before walking off into the night and never coming back.
Even though Hao Xuan did not have a name for it himself, the barbarians were more than willing to give it one.
They called it a "Djinn".
Hao Xuan was quite surprised to hear that name, and understandably so. He had come across the name back on earth more than a few times during one of the random google searches.
After inquiring about it in detail from Isak and Burak, he found quite a lot of similarities between the entities they were referring to and the ones he knew as such.