Mordric is a rune-keeper. And a dwarf. That should already be pretty self-explanatory - he uses his magical powers to accumulate gold and makes us, the pity hobbits-or-humans-or-whatever, envy his wealth whenever his shabby belly catches our sight. Thanks the Valar he sometimes pays a round in the Thorin's Hall Inn and invites poorer fellas for a good Bombur's Beard Lager!
Head: Baingarab, purple dye (Quest: Vol. I, Book 2, Chapter 5: Retake Weathertop; also available as Linen Hat, T2 crafted)
Back: Cloak of the Shining Star, purple dye (Anniversary event reward)