White Mask is a Helm in Elden Ring. White Mask is part of the War Surgeon  Set, and is a lightweight helm that strikes a good balance between Physical and Magical defense. White Mask protect the player's head by applying various defensive properties, it also changes the appearance when it is equipped. Some armor pieces may be available to both genders but may be slightly different for male and female characters.
There is a lock-out condition for the acquisition of this item. See the tips below for the details.

"Bloodstained, faintly grinning mask.
Worn by war surgeons who were effectively mercy killers.

The Lord of Blood's curse enlivens the wearer when bloodletting occurs. Slightly raises attack power when there is blood loss nearby."

Elden Ring White Mask Notes & Tips

• Sell Value: 

100

This helm increases the player's attack power by 10% for 20 seconds, once blood loss has been inflicted on an enemy (or the wearer). 

• This stacks with the Lord of Blood's Exultation buff.
• This attack power boost also affects the damage of spells (Sorceries and Incantations).
• Killing Mohg, Lord of Blood will lock you out of obtaining this set. If a player wishes to get the set and also kill Mohg, they have to kill the invader first.
• Poise Updated to patch 1.07
• Note: Patch 1.09: Effect reduced from 10% to 6% in PvP.