Ok so bizarre situation came up. A unit of Hexwraiths had Curse of Anraheir cast on them while they were in a large copse of trees. I normally would have not cared as I believed that ethereal units were immune to dangerous terrain checks, but oddly thats not what ethereal says when we looked up the rule. The Ethereal rule only states that the unit "Treat all terrain as Open Terrain", and the wording of Curse of Anraheir is literally the exact opposite "Treat all terrain as Dangerous Terrain". So which rule takes precedence? Can you have Dangerous Open Terrain? And the obvious second part of my question is if Curse of Anrahier does takes precedence is the dangerous terrain check forced by the spell technically a "magical effect" that can even hurt the Hexwraith?