Rare (Rare) Items add stats to all attributes and are only obtainable in dungeons by performing a series of tasks.
I have posted a guide to obtain these items and here it is.
Warlock Set (Int Base)
Warlock Helm
+40 Armor
+50 Intelligence
+165 to all Attributes
+Auto-Repair: Revives the Hero after 3 seconds upon death, has a 50 second cooldown
Acquired in the Ice labyrinth.
Easiest out of the 3 warlock items to retrieve. Ice walls must be broken to reach this item and is located under the waterfall.
Warlock Robe
+40 Armor
+50 Intelligence
+165 to all Attributes
+Blink: Allows the Hero to blink to dodge a missle or gain distance
Acquired in the Ice labyrinth.
Requires a Zepplin which can be purchased from the spider statue after defeating both Polar bears.
Warlock Shoulders
+40 Armor
+50 Intelligence
+165 to all Attributes
+Death Sentence: Deals a powerful 8500 spell damage to a single target
Acquired in the Ice labyrinth.
Once again the zepplin is required to reach this item, you must drop your hero quickly before it is destroyed by the traps.