Magister's Mantle

Part of the Mage-aimed Magister's Regalia, a Dungeon Set 1 gear set.

Source
This item drops from Ras Frostwhisper in Scholomance.

As a quest objective
This item is an objective of Anthion's Parting Words.

Please see the Dungeon Set 2 page for a walkthrough on upgrading your Set 1 pieces to Set 2.