Not yet observed in the beta: the Forever client retains this item's record without its stats. Those are sent by the server in-game.Until someone records it, the Classic tooltip is shown below. Forever has reviewed every dungeon's loot, so changes are expected.
In Classic Era, dropped by Crystal Fang, Lower Blackrock Spire(35%).
Classic 1.15.9.69722
Sunderseer Mantle
Binds when picked up
ShoulderCloth
65 Armor
+17 Intellect
+11 Spirit
+4 Stamina
Requires Level 56
Equip: Increases damage and healing done by magical spells and effects by up to 8.
Sell Price: 1g 64s 22c
Forever Beta 1.60.1.70009
This item does not exist in the Forever client.