How to get to Sul Vius: Demiplane of Life
In order to get to Sul Vius: Demiplane of Life you'll first need to get to Plane of Health. You can reach it through Plane of Tranquility, for more information go over to my How to get to Plane of Health Guide. Once you're in Plane of Health you'll want to travel to the northwestern most portion of the zone where you'll find a crypt with a single coffin inside (shown in the screen shot below).
Run over top of or click on the coffin and you'll zone into Sul Vius: Demiplane of Life.