The Eldar war mask is a psychological construct used by Eldar warriors protect their psyche during combat.
It acts as a separate personality that Eldar can don and remove as needed, allowing them to enter a state of vicious warrior mentality without being permanently affected by the horrors of war.
The Exarch is someone who is "lost" in the path, becoming in a monastic-cleric of the Aspect Shrine, instructor, guardian and guide of the warriors who walk the path or commnder of the guardians of the craftworld
I think you mean get a vague sense of the future. Also I'm like 99& sure that's not true. I mean some do start fights because a farseer told them to but I don't think its even the majority of the time much less always.
No, because the Aeldari probably had chainswords before humans were walking. And as a weapon for use on things on Orkz that don't really register wound shock a chainsword's a solid choice. Plenty of things in the galaxy don't die unless dismembered.
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It acts as a separate personality that Eldar can don and remove as needed, allowing them to enter a state of vicious warrior mentality without being permanently affected by the horrors of war.
The duality of being Aeldari.