The Crosswind Medallion is a trinket available for purchase in Thief.
This trinket reduces the chance of being hit by enemy projectiles. It costs 140 gold to purchase.
"This weathered medallion carries a carving of an arc of leaves blowing in a strong wind. It was 'found' in the lost grave of Silent Joff, a long-dead archer who never spoke and never missed. Wearing this item against the skin apparently makes the wearer harder to hit with arrows. Hopefully, Joff died by other means."
Reduces the chance of being hit by enemy projectiles