Very well thought out and executed. While I at first thought it would be strong, the territorial NEED to be in water clearings can force you into bad situations and acts as an indirect but extremely potent nerf. Very beautiful. I could see this added as a new official faction tomorrow, and I wish it was to be honest. Clear counterplay, not oppressive, and seems to be very fun and with a great theme. I love the idea of abducting an enemy warrior to go and sacrifice him at an altar, dragging them to a river to their doom. 10/10