Ethereal models can't be wounded except by spells and magical attacks or effects. Ethereal creatures can still be beaten in close combat and suffer extra wounds because combat results are not wholly dependent upon casualties. The close combat attacks of Ethereal creatures count as magical. Non-Ethereal characters cannot join Ethereal units.

Ethereal Movement

Ethereal creatures treat all terrain as open terrain for the purposes of movement. They may not finish their movement inside impassable terrain. They are also never affected by any special rule, spell or item that would otherwise reduce their movement or stop them moving completely (such as the Pit of Shades spell, for example).

Ethereal units cannot see through anything that would block the line of sight of normal units. Also, Ethereal creatures block line of sight normally (other models cannot see through them).