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 Bloodmage Thalnos, Scarlet Monastery Graveyard(48%).
Classic 1.15.9.69722
Bloodmage Mantle
Binds when picked up
ShoulderCloth
35 Armor
+8 Intellect
+4 Spirit
Requires Level 30
Sell Price: 21s 84c
Forever Beta 1.60.1.70009
This item does not exist in the Forever client.