From Ephinea PSO Wiki
- - In-game description
White Ring is a rare barrier that grants extra EVP if other players in the vicinity are also wearing a White Ring. For each other player within 5 meters wearing a White Ring, +25 EVP will be granted. This means that if all four players in a party are wearing White Rings within 5 meters of each other, each player will gain 75 EVP.
White Ring is obtainable in the quest Labyrinthine Trial by earning an S-Rank rating. This can only be done with a 4 player party.