"Sneaky Armor"

You gain +1 to all stealth checks while wearing this armor.

When you roll a D20 for your stealth check if your roll lands 11 or higher the stealth check proceeds as normal.

If instead you roll a 10 or lower the armor seizes up and you become Paralyzed for 1 minute.

The breastplate and shoulder protectors of this armor are made of leather that has been stiffened by being boiled in oil. The rest of the armor is made of softer and more flexible materials.