Upon reaching max level you may retrieve Dark Sets commonly referred to as DK All DK items are available at the City Hall by speaking to Cleroth the fat guy in cityhall.

Dark Knight

Dark Mage

The Dark Mage Magic Wand may be upgraded to max of +4

Hero Sets

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War Hero

+6 dmg +15 dmg (crits) +40 HR

Mage Hero

+4 dmg +40 HR

Hero Cape

300 ek for cape 50 ek for a catalyst, and i think you can buy catalysts also.The catalyst will consume the hero cape and make it into a dye, this can then be applied to a statted cape. They can also then be dyed and come out in some nice looking colours.