Remain Lights

Remain Lights (リメインライト), in ALfheim Online, are the leftover souls of killed players that remain in the place that they were killed in for about 1 minute, but this timer increases to 600 seconds (10 minutes) within a boss room or certain dungeons. During this time, the player can be revived on the spot with revive magic or items. If the player isn't revived before the timer expires, the Light vanishes and the player is returned to one's re-spawn point. Though dead players aren't able to move or take any action while they are dead, they can still hear and see what is going on around them.

In addition to dying and turning into a Remain Light, players incur a death penalty where they lose some of their stats.

Colors
The color of the Remain Light's flame is different for each race, based on their primary color:

Fairy Dance Arc


After Kirito skewered two Salamanders while protecting Leafa, they went up in flames, which were their Remain Lights. Their souls, after disappearing, go back to their respawn point, from where they could restart their journey.

While fighting to protect the Sylph-Cait Sith Alliance, Kirito killed General Eugene in a duel, turning him into a Remain Light. He was shortly revived by Sakuya under Kirito's request.

When Kirito attempted to clear the Grand Quest to climb the World Tree, he was defeated by an onslaught of Guardian Knights and turned into a Remain Light for the first time. Shortly afterwards, Leafa entered the tree to save Kirito and resurrected him with a World Tree Dewdrop after they had left the quest area.

During Kirito's second attempt to clear the Grand Quest, Recon used Sacrifice to help clear a massive wave of Guardian Knights, resulting in Recon dying and turning into a Remain Light, incurring a death penalty much larger than the one incurred by normal deaths.

Reference
Luz de permanencia Remain Light Посмертный огонь