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Players use duel points (often abbreviated to DP) when attacking other players. 1 duel = 1 DP.
Players earn 15 DP per day, but they get the ability to set their DP to 30 a day, in exchange for only being able to attack players that are a higher level than their own.
The skill shape reality increases DP regeneration by 1 every fourth level, regardless of whether they set their DP.