Como os Ynnari se protegem de Slaanesh?

Em relação aos Harlequins: aqueles com possessão possível são os Paciência.

The most chilling of all the Aeldari Harlequin are those individuals known as a Solitaire, called in the Aeldari Lexicon the arebennian. The Solitaires, as their name implies, are solitary individuals who roam the universe alone for most of his life, occasionally joining a masque for a single performance or battle as the fancy takes him. He speaks and is spoken to only in ritual form, and when he is not performing he rarely communicates with the other Aeldari. The most startling truth of the Solitaires is that, unlike other Harlequins, who are protected by their faith in Cegorach, their souls are doomed to be devoured by Slaanesh, although the Laughing God attempts to intercede on the Solitaire's behalf after their death and force the Prince of Chaos to compete for his or her soul. Whenever Solitaires are with a Harlequin troupe, they prefer to distance themselves from the others, and one is considered cursed if one exchanges words with a Solitaire. A Solitaire never shows any sign of emotion, either with other Harlequins or on the battlefield. Psykers of every race, even other Aeldari, are known to be very depressed in the presence of a Solitaire. The mental landscape of the Solitaire is obviously disturbing to them. Psychic attacks on Solitaires will almost always fall short, and weapons which attack the enemy's mind, such as the Neuro Disruptor, will simply have no effect.

Isso é semelhante ao Exorcists Astartes Chapter:

The Chapter was created through secret Inquisition experiments in which test subjects were deliberately allowed to be possessed by daemons for a time before the daemons were banished by Ordo Malleus Inquisitors. There were casualties, but the majority of test subjects survived and emerged unusually skilled in the ways of combating daemonkind as the Inquisition had hoped.

This has also caused the subjects to have no psychic signature that psykers can detect. The original test subjects, some two companies strong (200 Space Marines) were released onto a daemon-infested planet on the northern fringes of the Eye of Terror where they displayed extremely impressive results, achieving a kill ratio of 97:1.

Concernente Ynnead:

He will be so powerful that it has been foreseen that a new dimension will be created, alongside the Immaterium and the material universe, that will be a part of Ynnead. It has also been foreseen by the Aeldari that all of their souls will be forcibly pulled to Ynnead when they die, instead of being drawn into the Warp to be consumed by Slaanesh.

Então, será o mesmo que com Cegorach