Soul Vitality
From Telarapedia
Soul vitality is a percentage representing the "health" of your character's soul. To see your Souls vitality hover over the Skull and Crossbones icon next to your Character image in the upper left. When a player dies, 10% of soul vitality is lost. Resurrecting at the graveyard decreases it by an additional 25%. Lost soul vitality grants a Soul Exhaustion debuff once it reaches 0%, reducing all stats by 50% for 4 minutes. To restore soul vitality and/or remove the debuff, the player needs to get healed by a Healer.
If under 100%, the player's current soul vitality can be viewed by mousing over the skull-and-crossbones icon by the character portrait.