SHIELD SYSTEM - All of the characters in each class has an HP,MP,SP and a new SD(Orange Bar) Gauge which is an expanded concept of HP during PvP combat and automatic recovery is only possible in safe zones.
The SD decreases according to the rules below.
1) SD is affected only while playing PvP and not while ordinary monster hunting.
PvP = includes Personal Battles, Duel, Guild Wars, Chaos Castle, Castle Siege
2) When damage is received the rate of reduction for SD and HP is: SD 90%, HP 10%.
Your total SD depends on the character current stats.