Mysterious Mask

Gain 1 Critical Star when attacking with the engraved card. Decrease Critical Rate by 10% for the enemy (1 turn) when attacking with the engraved card.

Obtained during the FGO 6th Anniversary campaign. NA: Available for a limited time during the 6th Anniversary Commemorative Campaign 6/28/2023 21:00 PDT.

A mask said to be stored somewhere in Chaldea. Anyone can rent out this mask as long as they go through the proper channels, dealing with the person in charge. While this mask doesn't possess any concealing functions on a magecraft level, the wearer becomes "a person shrouded in mystery" simply by putting it on.