Korrin's Half Plate

Korrin's grey metal armour s made of light, flexible metal that is very strong. This medium armour (AC15) does not impose disadvantage on Dexterity (Stealth) checks and requires no Strength prerequisite to wear - unlike it's mundane, steel equivalent. It allows an additional benefit of +1 to the wearer's Dexterity modifier restriction whilst wearing the armour.

Once per encounter:  The first hit the wearer takes 'activates' the armour and turns it jet black. Upon a second successful hit in that same encounter, the activated armour reduces the damage from that hit to zero and returns to it's normal colour.