Remain Lights (
In addition to dying and turning into a Remain Light, players incur a death penalty where they lose some of their stats. Players also incur an item loss penalty if they are not revived before the timer expires, and the items are given to the player that killed them or, in the case of having a shared inventory (e.g. by being in a party), the lost items are first sent to the still alive players shared inventory, similar to the marriage system in Sword Art Online. In such a case, the attackers only receive the items if they manage to kill all of the members of the party.
The color of the Remain Light's flame is different for each race, based on their primary color:
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.
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.