Force projection

A Force projection was the visual manifestation of a Force user who had the ability to seemingly appear in one place while actually being elsewhere. Jedi Master Luke Skywalker projected an image of himself into the Battle of Crait to confront his nephew, Kylo Ren, which resulted in Skywalker's death due to the prolonged and strenuous energy needed to maintain the illusion.

Description
Force projection was the ability to project through the Force allowing the user to physically interact with their surroundings, despite not being physically present. The nature of it being only a projection allowed one to appear as if performing seemingly impossible feats, such as appearing unscathed after taking a barrage of blaster bolts, or disappearing from one position and then reappearing in another. It also allowed one to project something other than their true physical appearance, such as making oneself appear younger, or appearing to have an object not currently in their possession. Despite being otherwise immaterial, they were at least capable of physical contact with others. Such an ability, while very powerful, nonetheless had severe consequences when utilized: prolonged use of the ability would result in the user's death.

History
In 34 ABY, Jedi Master Luke Skywalker was able to project his appearance from Ahch-To to Crait, where he confronted his nephew, Kylo Ren, during the Battle of Crait. The feat was so strenuous that the prolonged use of the Force led to Skywalker's death, after which he became one with the Force. He carried a copy of Han Solo's dice with him that he left with General Leia Organa, who left it at the old Rebel base on the planet. Ren discovered the dice, which disappeared shortly after Skywalker's death.

Appearances

 * Star Wars: Force Arena
 * Star Wars: Episode VIII The Last Jedi
 * Star Wars: The Last Jedi: Expanded Edition
 * Star Wars: The Last Jedi: A Junior Novel
 * The Last Jedi Adaptation 6