Mark of Fordring is a reward from the In Dreams quest. The quest giver is Highlord Taelan Fordring, found in Western Plaguelands. To acquire the quest you have to complete the Tirion Fordring quest line, starting with Redemption and ending with Scarlet Subterfuge. Tirion Fordring can be found in the Eastern Plaguelands.
Highlord Taelan Fordring Location
Tirion Fordring Location
Speak to Myranda to gain the Scarlet Illusion. Travel to Hearthglen while under the Scarlet Illusion and deliver Tirion’s Gift to Highlord Taelan Fordring.
Hearthglen is to the north, Taelan should be inside of Mardenholde Keep.
Escort Taelan Fordring out of Hearthglen.