Monsters with a connection to the Ethereal Plane

[trentonjoe]

I am designing an encounter that involves dealing with the Ethereal Plane but am coming up pretty sparse with my knowledge of monsters that would be or can travel to the Ethereal Plane.

Right now I have phase spiders and ghosts. I am willing to just give the ethereal jaunt ability to anything and make a "phase gnoll" or something but wanted to see if there are cool monsters I haven't used because of their home environment.

 

[trentonjoe]

This site was quite helpful:

http://thecampaign20xx.blogspot.com/2016/03/dungeons-dragons-guide-to-ethereal-plane.html

 

[MonkeezOnFire]

Succubi/incubi can travel to the ethereal as an action. I had a succubus use this to tail the party for a good portion of the early levels.