The undead know more about the psychedelic realm than the living. They have seen it all before and know the way around. That's why they make the perfect guides for those who are new to this world.
When you first enter the psychedelic realm, it can be overwhelming. There are so many colors and patterns, it's hard to know where to look. But the undead guide will be there to guide you through it all. They'll show you the beauty of this world and help you find your way back to the living world when it's time.