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.
Rogue Set (Agi Base)
Rogue Hood
+40 Armor
+50 Agility
+165 to all Attributes
+Illusion Smoke: 45% Accuracy reduction and prevents all spells from being casted in an area for 12 seconds
Acquired in the Sunken Ruins.
Requires a transport naga to travel through water, Guarded by the forgotten one also known as The Kraken.
Rogue Cloak
+40 Armor
+50 Agility
+165 to all Attributes
+Magic Repel: 40% Magic Reduction
Nightmare Howl: Decreases enemy's armor by 30 and damage by 20% in an area when activated
Acquired in the Sunken Ruins.
Extremely difficult to get to this point, transport naga is require to cross the ruins.
Rogue Shoulders
+40 Armor
+50 Agility
+165 to all Attributes
+EMP Shield: Blocks one spell every 10 seconds
Acquired in the Sunken Ruins.
Requires transport naga, the item is located behind Unagi the serpent of the sunken ruins.
If you find it difficult to pass Unagi without dying you can also use a decoy transport naga to lure him out first.