My bard uses the Disco mastery spells of Despair and Tribulation. I double clicked the armor and got a message that it was on. Despair did the same amount of damage and lasted the same amount of time so that is not x2 Mastery. Tribulation lasted the same amount of time and the damage looked the same. The arms of the Virtuoso suit are NOT not mage armor so mage armor will have to imbued for any bard that uses Meditation(99% of bard templates that are using mastery spells are forced to have med for the mana upkeep of those spells). Looks like I wasted 200k of turn in points for suit that I will keep for deco.