The Etheric Realm is only accessible via the drug Archie. It is where the Emperor inhabits and keeps Henry Fogg for most of season five and came back with dementia. Zelda Schiff has hinted spending two years there before being kicked out. Kady Orloff-Diaz sends the Henry Fogg of Timeline 17 over there during the heist at the Nave Hotel.
History[]
While trying to find a stolen book depository, Kady Orloff-Diaz and Henry Fogg take Archie in order to go to the Etheric Realm. There they see things and people that do not appear on Earth, which leads Fogg to almost die.
A girl with rainbow color eyes that gives them cotton candy explains that nobody knows where anything is in the realm except the Emperor. At this moment, they see people dressed in bunny costumes hopping near them, a brown one waiving them to follow it.
Fogg and Kady follow the brown bunny to the pier where they see many people dressed as Elvis doing magic, a rain of all the socks ever lost, and the Emperor waiting for them.
The Emperor explains that as long as someone is in the Etheric Realm, the high Archie provides never goes away. Which leads to many people staying there for years. As a price to tell Kady where the book depository is, he asks Fogg to stay which he accepts. Kady is then kicked out and appears on the same pier but now empty and dark. [1]
Dean Fogg will find his way back to Earth, most likely after Psycho Fogg was sent there. But the dean do not have all his mind and seems to suffer dementia caused by his time in the Etheric Realm. Only when he "transfer the crazy" into a cat that he holds that Fogg can have all of his mind. [2]