Veil of Medrengard
From Warhammer 40k - Lexicanum
The Veil of Medrengard is a relic Chaos Knight device, that was created by the Warpsmiths of the Iron Warriors in M33.[1]
When the device is installed in a Knight suit, the Veil of Medrengard projects a barrier of energy that is of far greater power than a standard ion shield. Though it was originally gifted to House Garras for their service during the Horus Heresy, the device has since been passed to many other Iconoclast Knight Houses.[1]