Good day to you, fellow gamers.
While preparing for a published adventure, I have found that one of the enemies that the PCs will have to encounter have a free ability (as an action of course) to enter Ethereal plane and come back. My PCs are somewhere between 7 - 9 level, and, by design of the adventure, they will have both a time limit on this scene AND the need to destroy enemy in question. By the look of his stats, his best tactic is to jump into Etherealness and wait out for time to pass. The PCs will have to find some way to get him out from\see him on the Ethereal plane in order to succeed in their quest.
As far as my experience of rules go, here is what I know:
- Robe of the eyes, which allows the user to see creatures on the Ethereal plane within 120 feet
- See Invisibility, 2-d level divination, which allows to see into the Ethereal plane
Both of the ways might be unavailable to party during the scene, in which case the loss is guaranteed. I hope to find other ways the creature can be found or forced out of the Ethereal plane.
My party most likely will consist of following race\class combo:
- Wood elf\Ranger(Hunter)-Rogue
So, basically, the question is this:
What ways, in terms of magic items, abilities, magic, etc, are available for players to interact with Ethereal plane on their level?
P.S. For reasons I can't discuss I have no option to insert MucGuffins for players to succeed, except for information about that enemy and his abilities. So I would appreciate answers regarding to actual rules.