Mark of the Pariah is a heavy armor set. The 5-piece set bonus increases your Physical and Spell Resistance by up to 11094 based on your missing Health.
Mark of the Pariah is part of the Orsinium DLC and drops in Wrothgar in the Overland content. You can also find it on Guild Traders. Each set item is bound on equip. You can acquire heavy armor, jewelry and weapons for this set in the Malacath motif style.