They were born before we were, and they will last, long after we die.
Non-Nagani are no more then our lower caste. While they may have property in their lands, they are nothing more than the dirt at our feet. Even our lower class can order a human in our lands. One day it will be as such in their lands.
Rsskilarn, High Priest and second hand to Tlatoani
“Evil” often infests swamp. This tree thrives when the other plants wither under the presence of true Evil. However, this is not an evil plant, but a land healing one as nature attempts to reclaim its own.
On the muddy banks of the river deltas and the swamps they wait to wrap their prey in their crushing embrace.That is how they got their name.
Arakis's zombie problem went largely ignored, because it was believed that the Shai-Hulud (sand worms) would effectively dispose of the undead walkers. Unfortunately the problem grew until the roving herds of sunburnt ghouls threatened the flow of spice. While observing one of the great reanimated masses over take a Harvester from the safety of an ornithopter, an Imperial Zoologists noted that the sand caked flesh eating revenants walked entirely without rhythm.
Shortly after receiving this report the Bene Gesserits claimed to have a solution to Arakis's hellish resurrections. They asserted to the agents of the great houses that the worms could be drawn to the walkers using an ancient sonic weapon. According to the sisters, exposing the zombies to an antediluvian ballad composed by the great master M. Jackson would force them to step in time.