Ethereal
(Rule)Description: Ethereal creatures treat all terrain as open terrain for the purposes of movement. They may not finish their movement inside impassable terrain. They are never slowed by any special rule, spell or item that would otherwise reduce their movement or stop them from moving completely.
The Models have both the Magical Attacks and Unstable. Ethereal models can only be wounded by spells, magical attacks and magic weapons or effects. Ethereal creatures block line of sight normally and cannot see through anything that would block the line of sight of normal units. Characters that are not themselves Ethereal are not permitted to join units that are (even if they become temporarily Ethereal for some reason).