”A force of mind, holding his spirit together, preventing it from diffusing.
Cognitive Shadow is term used by Brandon to refer to a spirit that has not yet moved into the afterlife. While the manifestations of this kind of entity can vary depending on the world it occurs on, Cognitive Shadows can occur on any planet of the Cosmere. In general, they are similar to the concept of ghosts on Earth.
Cognitive shadows can be created by a variety of processes. Some of them are created when a person has sufficient attachment to something in the Physical Realm. When a Vessel that has held onto a Shard for a long time dies it becomes a Cognitive Shadow that can continue to act.  The Cognitive aspect of a recently deceased person can become a Cognitive Shadow by finding a source of Investiture to anchor themselves to the Cognitive Realm before passing on to the Beyond. The Investiture replaces the parts of the soul that connects it to the Three Realms, providing an anchor for it in the Cognitive Realm.  Some Vessels can prepare a Cognitive Shadow at or just prior to their death or Splintering, allowing a portion of their power to continue to function with a small amount of direction; the Stormfather is an example of this.
After his death, Kelsier managed to become a Cognitive Shadow by Investing himself using Preservation's Shardpool (the Well of Ascension). After becoming a Cognitive Shadow he was able to influence the Physical Realm, even holding the Shard Preservation for a time.
Common on Threnody, Shades are somewhat unique in that they can convert living people into more Shades. This is explained by the kind of Investiture the people on that planet have, as well as the lack of Shard.
- Mistborn: Secret History part 2 chapter 1 #
- Steelheart release party
— Arcanum - 2013-09-24#
- Orem signing 2014
— Arcanum - 2014-12-06#
- Worldbuilders AMA
— Arcanum - 2015-12-04#
- Oathbringer Houston signing
— Arcanum - 2017-11-18#
- Oathbringer London signing
— Arcanum - 2017-11-28#
- Orem signing
— Arcanum - 2017-12-21#
- Stormlight Three Update #6
— Arcanum - 2017-01-20#
- Words of Radiance San Francisco signing
— Arcanum - 2014-03-06#
- Shadows of Self San Francisco signing
— Arcanum - 2015-10-09#
|Shards||Ambition · Autonomy · Cultivation · Devotion · Dominion · Endowment · Honor · Odium · Preservation · Ruin · Survival Shard|
|Planets||Ashyn · Braize · First of the Sun · Nalthis · Obrodai · Roshar · Scadrial · Sel · Taldain · Threnody · Vax · Yolen|
|Terms||Adonalsium · Sliver · Splinter · Realmatic Theory · Investiture · Connection · Identity · Fortune · Intention · Perpendicularity · Spiritweb · Resonance|
|Worldhoppers||Hoid · Khriss · Nazh · Iyatil · Mraize · Vasher · Vivenna · Galladon · Demoux · Baon · Felt · Marsh · Nightblood|
|Other||Seventeenth Shard · Ire · Shattering · Letters · Silverlight|