Ethereal

Ethereal, sometimes referred as ghost form, is a type of status effect that makes a target immune to all physical damage, while also disarming them. It will also reduce their magic resistance, causing them to take additional magical damage. Afflicted units are able to control every other aspect of their character.

Ethereal units cannot be directly attacked, not even with manually cast active attack modifiers like. They are fully affected by spells, blocking physical damage but not preventing their other effects. For example, cannot damage ethereal units, but will still stun and slow them. Ethereal state does not dispel anything, but ethereal from items will cause Naga Siren's to not affect the targeted unit.