Uncommon
Wearer gains +1 to Constitution (thus, depending on prior Constitution score, either 0/+1 to Fortitude saving throws and either 0/+1 to max HP per character level) and -1 to AC
Wearer gains +1 to Dexterity and -1 to AC (thus, depending on prior Dexterity score, either 0/+1 To Hit with ranged attacks, either –1/0 to AC due to the drawback, and either 0/+1 to Reflex saving throws)
Wearer gains +1 to Strength (thus, depending on prior Strength score, adding either 0/+1 To Hit in melee and either 0/+1 Damage with melee and thrown weapons) and -1 to AC
The wearer is immune to the extra damage caused by sneak attacks. The wearer is not immune to the attack itself–only the bonus damage from the sneak attack is negated.
Once per game, up to 3 points of melee damage inflicted on the wearer can be negated. The damage must come from a single melee attack. Neither missile nor magical damage can be negated by this cloak.