Harmonic Chainmail in Heroes 4

Increases the hero’s Melee and Ranged Defense by 15, and grants the hero Mirth. Targets attacked by a hero wearing the Harmonic Chanmail, the Necklace of Muses, and wielding Aiffe’s Mandolin are effected by Song of Peace, as if the spell was cast on them.

Though obviously very old, this armor shows no sign of wear or decay—a tribute to the skill of craftsmen long since passed away. When things are quiet you can hear an almost imperceptible song coming from the mail, perhaps from a spirit residing inside.