creatures of the ethereal plane 5e

The thick boar-infested woods and the sere, olive-covered hillsides hold evidence of their passing. Those brave enough to travel to the Deep Ethereal can use the Ethereal Plane as a gateway to travel the multiverse. The four Elemental PlanesAir, Earth, Fire, and Waterform a ring around the Material Plane, suspended within the churning Elemental Chaos. The desires of the mighty forces that dwell on these planes can remake them completely, effectively erasing and rebuilding existence itself to better fulfill their own needs. Farther from the Material Plane, though, the Elemental Planes are both alien and hostile. Strange, spectral knights attack a friend or relative of the characters. //
Tamara Strait Age, Articles C